20 January 2021, Lower Saxony, Hanover: A two-year-old child plays in the living room while his mother works on a laptop in the home office. The retreat from the workplace to the home office is to become a central building block in the fight against the Corona pandemic. Photo: Julian Stratenschulte/dpa

20 January 2021, Lower Saxony, Hanover: A two-year-old child climbs onto a chair next to his mother, who is working on a laptop in her home office. The retreat from the workplace to the home office is to become a central building block in the fight against the Corona pandemic. Photo: Julian Stratenschulte/dpa

20 January 2021, Lower Saxony, Hanover: A two-year-old child climbs on a piece of playground equipment in the living room while his mother works on a laptop in the home office. The retreat from the workplace to the home office is to become a central building block in the fight against the Corona pandemic. Photo: Julian Stratenschulte/dpa

20 January 2021, Lower Saxony, Hanover: A two-year-old child draws a picture while his mother works on a laptop in her home office. The retreat from the workplace to the home office is to become a central building block in the fight against the Corona pandemic. Photo: Julian Stratenschulte/dpa

20 January 2021, Lower Saxony, Hanover: A two-year-old child plays in the living room while his mother works on a laptop in the home office. The retreat from the workplace to the home office is to become a central building block in the fight against the Corona pandemic. Photo: Julian Stratenschulte/dpa

20 January 2021, Lower Saxony, Hanover: A two-year-old child plays in the living room while his mother works on a laptop in the home office. The retreat from the workplace to the home office is to become a central building block in the fight against the Corona pandemic. Photo: Julian Stratenschulte/dpa

20 January 2021, Lower Saxony, Hanover: A two-year-old child plays in the living room while his mother works on a laptop in the home office. The retreat from the workplace to the home office is to become a central building block in the fight against the Corona pandemic. Photo: Julian Stratenschulte/dpa

20 January 2021, Lower Saxony, Hanover: A two-year-old child plays in the living room while his mother works on a laptop in the home office. The retreat from the workplace to the home office is to become a central building block in the fight against the Corona pandemic. Photo: Julian Stratenschulte/dpa

20 January 2021, Lower Saxony, Hanover: A two-year-old child plays in the living room while his mother works on a laptop in the home office. The retreat from the workplace to the home office is to become a central building block in the fight against the Corona pandemic. Photo: Julian Stratenschulte/dpa

20 January 2021, Lower Saxony, Hanover: A two-year-old child climbs on a piece of playground equipment in the living room while his mother works on a laptop in the home office. The retreat from the workplace to the home office is to become a central building block in the fight against the Corona pandemic. Photo: Julian Stratenschulte/dpa

20 January 2021, Lower Saxony, Hanover: A two-year-old child stands next to his mother, who is working on a laptop in her home office. The retreat from the workplace to the home office is to become a central building block in the fight against the Corona pandemic. Photo: Julian Stratenschulte/dpa

20 January 2021, Saxony, Dresden: Animal keepers measure a male Bactrian camel during the zoo's annual inventory. As every year, the zoo is concerned with a lot of figures after the turn of the year, when the entire animal population is precisely recorded and documented. Photo: Sebastian Kahnert/dpa-Zentralbild/dpa

20 January 2021, Saxony, Dresden: Annka Lewertoff, animal keeper, stands in the enclosure of the zebra mongooses during feeding as part of the annual inventory at the zoo. As in every year, the zoo is concerned with a lot of figures after the turn of the year, when the entire animal population is precisely recorded and documented. Photo: Sebastian Kahnert/dpa-Zentralbild/dpa

20 January 2021, Saxony, Dresden: A snowy owl sits in its enclosure as part of the zoo's annual inventory. As every year, the zoo is concerned with a lot of figures after the turn of the year, when the entire animal population is precisely recorded and documented. Photo: Sebastian Kahnert/dpa-Zentralbild/dpa

20 January 2021, Saxony, Dresden: Two cheetahs lie in their enclosure as part of the zoo's annual inventory. As in every year, the zoo is concerned with a lot of figures after the turn of the year, when the entire animal population is precisely recorded and documented. Photo: Sebastian Kahnert/dpa-Zentralbild/dpa

20 January 2021, Saxony, Dresden: A Humboldt penguin swims in a pool of water as part of the zoo's annual inventory. As every year, the zoo is concerned with lots of figures after the turn of the year, when the entire animal population is precisely recorded and documented. Photo: Sebastian Kahnert/dpa-Zentralbild/dpa

20 January 2021, Saxony, Dresden: Zebra mongooses stand in their enclosure during feeding as part of the zoo's annual inventory. As every year, the zoo is concerned with lots of numbers after the turn of the year when the entire animal population is precisely recorded and documented. Photo: Sebastian Kahnert/dpa-Zentralbild/dpa

20 January 2021, Saxony, Dresden: Annka Lewertoff, animal keeper, stands in the enclosure of the zebra mongooses during feeding as part of the annual inventory at the zoo. As in every year, the zoo is concerned with a lot of figures after the turn of the year, when the entire animal population is precisely recorded and documented. Photo: Sebastian Kahnert/dpa-Zentralbild/dpa

20 January 2021, Saxony, Dresden: Two cheetahs lie in their enclosure as part of the zoo's annual inventory. As in every year, the zoo is concerned with a lot of figures after the turn of the year, when the entire animal population is precisely recorded and documented. Photo: Sebastian Kahnert/dpa-Zentralbild/dpa

20 January 2021, Hamburg: Peter Tschentscher (SPD, r-l), First Mayor in Hamburg, Katharina Fegebank (Bundnis 90/Die Grunen), Hamburg's Second Mayor and Senator for Science, Research and Equality, and Ties Rabe (SPD), Senator for Schools and Vocational Training in Hamburg, arrive for a special state press conference in the Kaisersaal in the City Hall. Mayor Tschentscher and the senators spoke on the results of the Senate meeting on further measures to contain the Corona pandemic. Photo: Christian Charisius/dpa

20 January 2021, Baden-Wuerttemberg, Tubingen: "AI Research Buildung" is located on a building at the University of Tubingen, which is part of the "Cyber Valley". The Cluster of Excellence "Machine Learning" of the Department of Computer Science of the Faculty of Mathematics and Natural Sciences is located here. (to dpa "Artificial intelligence is booming and the southwest is setting the pace") Photo: Sebastian Gollnow/dpa

20 January 2021, Bavaria, Munich: Markus S?der (CSU), Prime Minister of Bavaria, attends a press conference after the meeting of the Bavarian cabinet. The focus of the deliberations was once again the Corona pandemic. The current lockdown is to be extended. Photo: Peter Kneffel/dpa

20 January 2021, North Rhine-Westphalia, Putz: Wind turbines spin against the grey sky. Photo: Federico Gambarini/dpa

20 January 2021, Bavaria, Munich: Markus S?der (CSU), Prime Minister of Bavaria, attends a press conference after the meeting of the Bavarian cabinet. The focus of the deliberations was once again the Corona pandemic. The current lockdown is to be extended. Photo: Peter Kneffel/dpa

20 January 2021, North Rhine-Westphalia, Niederembt: Wind turbines turn against the grey sky behind Sankt Martinus, the Roman Catholic parish church of Niederembt. Photo: Federico Gambarini/dpa

20 January 2021, Bavaria, Munich: Markus S?der (CSU), Prime Minister of Bavaria, arrives for a press conference after the meeting of the Bavarian cabinet. The focus of the deliberations was once again the Corona pandemic. The current lockdown is to be extended. Photo: Peter Kneffel/dpa

20 January 2021, Bavaria, Munich: Markus S?der (CSU, r), Minister-President of Bavaria, attends a press conference after the meeting of the Bavarian cabinet. The focus of the deliberations was once again the Corona pandemic. The current lockdown is to be extended. Photo: Peter Kneffel/dpa

Former U.S President George W. Bush and his wife Laura Bush arrive for the inauguration of Joe Biden as the 46th President of the United States on the West Front of the U.S. Capitol in Washington, U.S., January 20, 2021. REUTERS/Jonathan Ernst/Pool | usage worldwide

Vice President Kamala Harris reacts after singer Jennifer Lopez performed during the 59th presidential inauguration in Washington, D.C., U.S., on Wednesday, Jan. 20, 2021. Biden will propose a broad immigration overhaul on his first day as president, including a shortened pathway to U.S. citizenship for undocumented migrants - a complete reversal from Donald Trump's immigration restrictions and crackdowns, but one that faces major roadblocks in Congress. Photographer: Kevin Dietsch/UPI | usage worldwide

Country singer Garth Brooks shakes hands with former Vice President Mike Pence during the 59th Presidential Inauguration at the U.S. Capitol in Washington, Wednesday, Jan. 20, 2021. (AP Photo/Susan Walsh, Pool) | usage worldwide

U.S. President Joe Biden speaks during the 59th presidential inauguration in Washington, D.C., U.S., on Wednesday, Jan. 20, 2021. Biden will propose a broad immigration overhaul on his first day as president, including a shortened pathway to U.S. citizenship for undocumented migrants - a complete reversal from Donald Trump's immigration restrictions and crackdowns, but one that faces major roadblocks in Congress. Photographer: Kevin Dietsch/UPI | usage worldwide

Lady Gaga performs during the 59th Presidential Inauguration on Wednesday, January 20, 2021 at the U.S. Capitol in Washington, D.C. | usage worldwide

U.S. President Joe Biden, right, speaks during the 59th presidential inauguration in Washington, D.C., U.S., on Wednesday, Jan. 20, 2021. Biden will propose a broad immigration overhaul on his first day as president, including a shortened pathway to U.S. citizenship for undocumented migrants - a complete reversal from Donald Trump's immigration restrictions and crackdowns, but one that faces major roadblocks in Congress. Photographer: Kevin Dietsch/UPI | usage worldwide

Joe Biden is sworn in as the 46th president of the United States by Chief Justice John Roberts as Jill Biden holds the Bible during the 59th Presidential Inauguration at the U.S. Capitol in Washington, Wednesday, Jan. 20, 2021. (AP Photo/Andrew Harnik) | usage worldwide

President Joe Biden is seen after giving his inaugural address after being sworn in as the 46th president during the 59th Presidential Inauguration on Wednesday, January 20, 2021 at the U.S. Capitol in Washington, D.C. | usage worldwide

Kamala Harris reacts after being sworn in as Vice President of the United States during the inauguration of Joe Biden as the 46th President of the United States on the West Front of the U.S. Capitol in Washington, U.S., January 20, 2021. REUTERS/Jonathan Ernst/Pool | usage worldwide

Vice President Kamala Harris hugs her husband Doug Emhoff after being sworn-in during the inauguration of Joe Biden as the 46th President of the United States on the West Front of the U.S. Capitol in Washington, U.S., January 20, 2021. REUTERS/Jonathan Ernst/Pool | usage worldwide

US President-elect Joe Biden talks to US singer Jennifer Lopez during the Inauguration ceremony of Joe Biden as the 46th US President on January 20, 2021, at the US Capitol in Washington, DC. - Biden, a 78-year-old former vice president and longtime senator, takes the oath of office at noon (1700 GMT) on the US Capitol's western front, the very spot where pro-Trump rioters clashed with police two weeks ago before storming Congress in a deadly insurrection. (Photo by Saul LOEB / POOL / AFP) | usage worldwide

UNITED STATES - January 20: President Joe Biden hugs first lady Jill Biden after he is sworn in as the 46th President of the United States by Supreme Court Chief Justice John Roberts on the West Front of the Capitol on Wednesday, Jan. 20, 2021. (Photo by Caroline Brehman/CQ Roll Call) | usage worldwide

WASHINGTON, DC - JANUARY 20: President-elect Joe Biden and Jill Biden, and Vice President-elect Kamala D. Harris and Doug Emhoff arrive at the U.S. Capitol ahead of the inauguration of President Joe Biden on January 20, 2021 in Washington, DC. (Photo by Melina Mara/The Washington Post/POOL) | usage worldwide

Sen. Cory Booker (D-N.J.) and Rosario Dawson speak to Sen. Bernie Sanders (I-Vt.) prior to the 59th Presidential Inauguration on Wednesday, January 20, 2021 at the U.S. Capitol in Washington, D.C. | usage worldwide

Vice President Kamala Harris and Mike Pence. Joe Biden is sworn in as the 46th President of the United States on Capitol Hill in Washington, DC on January 20, 2020. (Erin Schaff/The New York Times NYTINAUG NYTCREDIT: Erin Schaff/The New York Times | usage worldwide

WASHINGTON, DC - JANUARY 20, 2021: Vice President Kamala D. Harris and Doug Emhoff, after the inauguration of President Joe Biden on January 20, 2021 in Washington, DC. (Photo by Melina Mara/The Washington Post/POOL) | usage worldwide

US singer Lady Gaga talks to Former US President Barack Obama during the Joe Biden's Inauguration ceremony as the 46th US President on January 20, 2021, at the US Capitol in Washington, DC. - Biden, a 78-year-old former vice president and longtime senator, takes the oath of office at noon (1700 GMT) on the US Capitol's western front, the very spot where pro-Trump rioters clashed with police two weeks ago before storming Congress in a deadly insurrection. (Photo by Saul LOEB / POOL / AFP) | usage worldwide

U.S. President Joe Biden, left, fist bumps Vice President Kamala Harris during the 59th presidential inauguration in Washington, D.C., U.S., on Wednesday, Jan. 20, 2021. Biden will propose a broad immigration overhaul on his first day as president, including a shortened pathway to U.S. citizenship for undocumented migrants - a complete reversal from Donald Trump's immigration restrictions and crackdowns, but one that faces major roadblocks in Congress. Photographer: Kevin Dietsch/UPI | usage worldwide

President Joe Biden hugs his wife Dr. Jill Biden after taking the oath of office during the 59th Presidential Inauguration on Wednesday, January 20, 2021 at the U.S. Capitol in Washington, D.C. | usage worldwide

US Vice President-elect Kamala Harris (L) is sworn in as the 49th US Vice President by Supreme Court Justice Sonia Sotomayor on January 20, 2021, at the US Capitol in Washington, DC. (Photo by Saul LOEB / POOL / AFP) | usage worldwide

U.S. President Joe Biden, right, and First Lady Jill Biden exit during the 59th presidential inauguration in Washington, D.C., U.S., on Wednesday, Jan. 20, 2021. Biden will propose a broad immigration overhaul on his first day as president, including a shortened pathway to U.S. citizenship for undocumented migrants - a complete reversal from Donald Trump's immigration restrictions and crackdowns, but one that faces major roadblocks in Congress. Photographer: Kevin Dietsch/UPI | usage worldwide

Jon Bon Jovi performs during ??sCelebrating America,??? a primetime program to welcome a New Era of Leadership in celebration of the Inauguration of Joe Biden as President of the United States and Kamala Harris as Vice President of the US on January 20, 2021. Credit: Biden Inaugural Committee via CNP | usage worldwide

20 January 2021, Schleswig-Holstein, Kiel: Daniel Gunther (CDU), Minister President of Schleswig-Holstein, speaks in the plenary hall of the state parliament. The state parliament discusses the Corona situation in a special session following resolutions by the federal and state governments. Photo: Axel Heimken/dpa

20 January 2021, Schleswig-Holstein, Kiel: Daniel Gunther (CDU), Minister President of Schleswig-Holstein, speaks in the plenary hall of the state parliament. The state parliament discusses the Corona situation in a special session following resolutions by the federal and state governments. Photo: Axel Heimken/dpa

20 January 2021, Hessen, Rudesheim am Rhein: Covered tables stand in front of a closed restaurant in the Drosselgasse in Rudesheim, which is popular with foreign tourists. There, where usually about three million visitors are counted per year, all shops, hotels and restaurants have now closed. The Corona lockdown has also led to a drastic drop in visitor numbers in areas of Hesse that are otherwise popular with tourists. Photo: Boris Roessler/dpa

A historic military marching band walks on Pennsylvania Avenue during the 59th presidential inauguration parade in Washington, D.C., U.S., on Wednesday, Jan. 20, 2021. Biden will propose a broad immigration overhaul on his first day as president, including a shortened pathway to U.S. citizenship for undocumented migrants - a complete reversal from Donald Trump's immigration restrictions and crackdowns, but one that faces major roadblocks in Congress. Credit: Al Drago / Pool via CNP | usage worldwide

A historic military marching band walks on Pennsylvania Avenue during the 59th presidential inauguration parade in Washington, D.C., U.S., on Wednesday, Jan. 20, 2021. Biden will propose a broad immigration overhaul on his first day as president, including a shortened pathway to U.S. citizenship for undocumented migrants - a complete reversal from Donald Trump's immigration restrictions and crackdowns, but one that faces major roadblocks in Congress. Credit: Al Drago / Pool via CNP | usage worldwide

President Joe Biden and first lady Jill Biden hug as they arrive at the North Portico of the White House, Wednesday, Jan. 20, 2021, in Washington. Credit: Alex Brandon / Pool via CNP | usage worldwide

President Joe Biden and first lady Jill Biden hug as they arrive at the North Portico of the White House, Wednesday, Jan. 20, 2021, in Washington. Credit: Alex Brandon / Pool via CNP | usage worldwide

President Joe Biden and first lady Jill Biden hug as they arrive at the North Portico of the White House, Wednesday, Jan. 20, 2021, in Washington. Credit: Alex Brandon / Pool via CNP | usage worldwide

Metropolitan Police Department of the District of Columbia motorcycles pass the White House on Pennsylvania Avenue during the 59th presidential inauguration parade in Washington, D.C., U.S., on Wednesday, Jan. 20, 2021. Biden will propose a broad immigration overhaul on his first day as president, including a shortened pathway to U.S. citizenship for undocumented migrants - a complete reversal from Donald Trump's immigration restrictions and crackdowns, but one that faces major roadblocks in Congress. Credit: Al Drago / Pool via CNP | usage worldwide

NYTINAUG - President Joe Biden and First Lady Dr. Jill Biden received Presidential Escort to the White House, Wednesday, Jan. 20, 2021. Photo by Doug Mills/The New York Times) Credit: Doug Mills / Pool via CNP | usage worldwide

A historic military marching band walks on Pennsylvania Avenue during the 59th presidential inauguration parade in Washington, D.C., U.S., on Wednesday, Jan. 20, 2021. Biden will propose a broad immigration overhaul on his first day as president, including a shortened pathway to U.S. citizenship for undocumented migrants - a complete reversal from Donald Trump's immigration restrictions and crackdowns, but one that faces major roadblocks in Congress. Credit: Al Drago / Pool via CNP | usage worldwide

20 January 2021, Brandenburg, Potsdam: Dietmar Woidke (SPD), Minister President of Brandenburg, sits at his seat wearing a medical mouth-nose mask before informing the members of the state parliament about the results of the conference of the heads of government with the Chancellor to further fight the Corona pandemic. Photo: Soeren Stache/dpa-Zentralbild/ZB

20 January 2021, Palestinian Territories, Deir al-Balah: A Palestinian policeman from combating explosives team inspects the rubble of a destroyed house east of al-Maghazi refugee camp, near the border fence with Israel, in the central Gaza Strip. Israeli tanks struck Hamas military posts in the southern Gaza Strip on Tuesday night after Palestinian militants fired a projectile into Israeli territory. Photo: Mohammed Talatene/dpa

20 January 2021, Palestinian Territories, Deir al-Balah: Palestinian policemen from combating explosives team inspect the rubble of a destroyed house east of al-Maghazi refugee camp, near the border fence with Israel, in the central Gaza Strip. Israeli tanks struck Hamas military posts in the southern Gaza Strip on Tuesday night after Palestinian militants fired a projectile into Israeli territory. Photo: Mohammed Talatene/dpa

20 January 2021, Palestinian Territories, Deir al-Balah: Palestinian policemen from combating explosives team inspect the rubble of a destroyed house east of al-Maghazi refugee camp, near the border fence with Israel, in the central Gaza Strip. Israeli tanks struck Hamas military posts in the southern Gaza Strip on Tuesday night after Palestinian militants fired a projectile into Israeli territory. Photo: Mohammed Talatene/dpa

20 January 2021, Palestinian Territories, Deir al-Balah: A Palestinian policeman from combating explosives team inspects the rubble of a destroyed house east of al-Maghazi refugee camp, near the border fence with Israel, in the central Gaza Strip. Israeli tanks struck Hamas military posts in the southern Gaza Strip on Tuesday night after Palestinian militants fired a projectile into Israeli territory. Photo: Mohammed Talatene/dpa

20 January 2021, Palestinian Territories, Deir al-Balah: Palestinian policemen from combating explosives team inspect the rubble of a destroyed house east of al-Maghazi refugee camp, near the border fence with Israel, in the central Gaza Strip. Israeli tanks struck Hamas military posts in the southern Gaza Strip on Tuesday night after Palestinian militants fired a projectile into Israeli territory. Photo: Mohammed Talatene/dpa

20 January 2021, North Rhine-Westphalia, Duesseldorf: The defendant holds a file folder in front of his face in the courtroom of the Higher Regional Court. He is charged with murder and is alleged to have remotely detonated a bomb in front of a Sri Lankan army convoy in Sri Lanka when he was 15 years old. The attack is said to have killed six people and injured many others a good twelve years ago. Photo: Federico Gambarini/dpa

20 January 2021, North Rhine-Westphalia, Duesseldorf: The defendant holds a file folder in front of his face in the courtroom of the Higher Regional Court. He is charged with murder and is alleged to have remotely detonated a bomb in front of a Sri Lankan army convoy in Sri Lanka when he was 15 years old. Six people are said to have been killed and many others injured in the attack a good twelve years ago. Photo: Federico Gambarini/dpa

20 January 2021, North Rhine-Westphalia, Duesseldorf: The defendant holds a file folder in front of his face in the courtroom of the Higher Regional Court. He is charged with murder and is alleged to have remotely detonated a bomb in front of a Sri Lankan army convoy in Sri Lanka when he was 15 years old. The attack is said to have killed six people and injured many others a good twelve years ago. Photo: Federico Gambarini/dpa

20 January 2021, North Rhine-Westphalia, Duesseldorf: The defendant holds a file folder in front of his face in the courtroom of the Higher Regional Court. Next to him sits his lawyer, Christoph Wingerter. The man is charged with murder and is alleged to have remotely detonated a bomb in front of a Sri Lankan army convoy when he was 15 years old in Sri Lanka. Six people are said to have been killed and many others injured in the attack a good twelve years ago. Photo: Federico Gambarini/dpa

20 January 2021, North Rhine-Westphalia, Duesseldorf: The defendant holds a file folder in front of his face in the courtroom of the Higher Regional Court. Next to him sits his lawyer, Christoph Wingerter. The man is charged with murder and is alleged to have remotely detonated a bomb in front of a Sri Lankan army convoy when he was 15 years old in Sri Lanka. Six people are said to have been killed and many others injured in the attack a good twelve years ago. Photo: Federico Gambarini/dpa

20 January 2021, North Rhine-Westphalia, Duesseldorf: The defendant holds a file folder in front of his face in the courtroom of the Higher Regional Court. Next to him sits his lawyer, Christoph Wingerter. The man is charged with murder and is alleged to have remotely detonated a bomb in front of a Sri Lankan army convoy when he was 15 years old in Sri Lanka. Six people are said to have been killed and many others injured in the attack a good twelve years ago. Photo: Federico Gambarini/dpa

20 January 2021, North Rhine-Westphalia, Duesseldorf: The defendant holds a file folder in front of his face in the courtroom of the Higher Regional Court. Next to him sits his lawyer, Christoph Wingerter. The man is charged with murder and is alleged to have remotely detonated a bomb in front of a Sri Lankan army convoy when he was 15 years old in Sri Lanka. Six people are said to have been killed and many others injured in the attack a good twelve years ago. Photo: Federico Gambarini/dpa

20 January 2021, Lower Saxony, Brunswick: The words "here's where the music plays" are written above the windows of a closed pub in the city centre. Chancellor Merkel and the heads of state governments have agreed to extend the lockdown until February 14. Photo: Hauke-Christian Dittrich/dpa

20 January 2021, Lower Saxony, Brunswick: The words "here's where the music plays" are written above the windows of a closed pub in the city centre. Chancellor Merkel and the heads of state governments have agreed to extend the lockdown until February 14. Photo: Hauke-Christian Dittrich/dpa

20 January 2021, Lower Saxony, Brunswick: Only a few people are out and about in the pedestrian zone of the city centre. Chancellor Merkel and the heads of state governments have decided to extend the lockdown until February 14. Photo: Hauke-Christian Dittrich/dpa

20 January 2021, Lower Saxony, Brunswick: The words "here's where the music plays" are written above the windows of a closed pub in the city centre. Chancellor Merkel and the heads of state governments have agreed to extend the lockdown until February 14. Photo: Hauke-Christian Dittrich/dpa

20 January 2021, Lower Saxony, Brunswick: Only a few people are out and about in the pedestrian zone of the city centre. Chancellor Merkel and the heads of state governments have decided to extend the lockdown until February 14. Photo: Hauke-Christian Dittrich/dpa

20 January 2021, Baden-Wuerttemberg, Stuttgart: Windows are lit up in the evening in houses in Stuttgart's West district. Photo: Marijan Murat/dpa

20 January 2021, Baden-Wuerttemberg, Stuttgart: Two women are standing on a viewing platform above Stuttgart's city centre. Photo: Marijan Murat/dpa

20 January 2021, Baden-Wuerttemberg, Stuttgart: Two women walk on a viewing platform above Stuttgart's city centre. Photo: Marijan Murat/dpa

20 January 2021, Baden-Wuerttemberg, Stuttgart: Windows are lit up in the evening in houses in Stuttgart's West district. Photo: Marijan Murat/dpa

20 January 2021, Baden-Wuerttemberg, Stuttgart: Windows are lit up in the evening in houses in Stuttgart's West district. Photo: Marijan Murat/dpa

20 January 2021, Saxony, Dresden: Two cheetahs lie in their enclosure as part of the zoo's annual inventory. As in every year, the zoo is concerned with a lot of figures after the turn of the year, when the entire animal population is precisely recorded and documented. Photo: Sebastian Kahnert/dpa-Zentralbild/dpa

20 January 2021, Lower Saxony, Hanover: A two-year-old child plays in the living room at home. Many daycare centers offer only emergency care in the current Corona situation, so many family with working parents are faced with childcare problems. Photo: Julian Stratenschulte/dpa

20 January 2021, Mecklenburg-Western Pomerania, Waren (Muritz): Closed is the "Warener Gluhweinstadt" on the almost deserted market place. On 07.01.2021, the district of Mecklenburgische Seenplatte was the first district in Mecklenburg-Vorpommern to exceed the critical limit of 200 new infections per 100,000 inhabitants within seven days. Photo: Bernd Wustneck/dpa-Zentralbild/dpa

20 January 2021, Mecklenburg-Western Pomerania, Waren (Muritz): The pedestrian boulevard in the city centre is almost deserted. On 07.01.2021, the district of Mecklenburgische Seenplatte was the first district in Mecklenburg-Vorpommern to exceed the critical limit of 200 new infections per 100,000 inhabitants within seven days. Photo: Bernd Wustneck/dpa-Zentralbild/dpa

20 January 2021, Saxony, Dresden: Winterlings bloom in a meadow. Photo: Sebastian Kahnert/dpa-Zentralbild/dpa

20 January 2021, Saxony, Dresden: Winterlings bloom in a meadow. Photo: Sebastian Kahnert/dpa-Zentralbild/dpa

20 January 2021, Saxony, Dresden: Winterlings bloom in a meadow. Photo: Sebastian Kahnert/dpa-Zentralbild/dpa

20 January 2021, Mecklenburg-Western Pomerania, Waren (Muritz): The Muritzeum is closed. On 07.01.2021, the district of Mecklenburgische Seenplatte was the first district in Mecklenburg-Vorpommern to exceed the critical limit of 200 new infections per 100,000 inhabitants within seven days. Photo: Bernd Wustneck/dpa-Zentralbild/dpa

Jen Psaki, White House Press Secretary, speaks during a press briefing in the James S. Brady Press Briefing Room at the White House in Washington, D.C., U.S., on Wednesday, Jan. 20, 2021. President Joe Biden will propose a broad immigration overhaul on his first day as president, including a shortened pathway to U.S. citizenship for undocumented migrants - a complete reversal from Donald Trump's immigration restrictions and crackdowns, but one that faces major roadblocks in Congress. Credit: Stefani Reynolds / Pool via CNP | usage worldwide

Jen Psaki, White House Press Secretary, speaks during a press briefing in the James S. Brady Press Briefing Room at the White House in Washington, D.C., U.S., on Wednesday, Jan. 20, 2021. President Joe Biden will propose a broad immigration overhaul on his first day as president, including a shortened pathway to U.S. citizenship for undocumented migrants - a complete reversal from Donald Trump's immigration restrictions and crackdowns, but one that faces major roadblocks in Congress. Credit: Stefani Reynolds / Pool via CNP | usage worldwide

Jen Psaki, White House Press Secretary, speaks during a press briefing in the James S. Brady Press Briefing Room at the White House in Washington, D.C., U.S., on Wednesday, Jan. 20, 2021. President Joe Biden will propose a broad immigration overhaul on his first day as president, including a shortened pathway to U.S. citizenship for undocumented migrants - a complete reversal from Donald Trump's immigration restrictions and crackdowns, but one that faces major roadblocks in Congress. Credit: Stefani Reynolds / Pool via CNP | usage worldwide

United States President Joe Biden signs executive order on Covid-19 during his first minutes in the Oval Office, Wednesday, Jan. 20, 2021. President Biden as the 46th president of the United States. Credit: Doug Mills / Pool via CNP | usage worldwide

Jen Psaki, White House Press Secretary, speaks during a press briefing in the James S. Brady Press Briefing Room at the White House in Washington, D.C., U.S., on Wednesday, Jan. 20, 2021. President Joe Biden will propose a broad immigration overhaul on his first day as president, including a shortened pathway to U.S. citizenship for undocumented migrants - a complete reversal from Donald Trump's immigration restrictions and crackdowns, but one that faces major roadblocks in Congress. Credit: Stefani Reynolds / Pool via CNP | usage worldwide

Jen Psaki, White House Press Secretary, speaks during a press briefing in the James S. Brady Press Briefing Room at the White House in Washington, D.C., U.S., on Wednesday, Jan. 20, 2021. President Joe Biden will propose a broad immigration overhaul on his first day as president, including a shortened pathway to U.S. citizenship for undocumented migrants - a complete reversal from Donald Trump's immigration restrictions and crackdowns, but one that faces major roadblocks in Congress. Credit: Stefani Reynolds / Pool via CNP | usage worldwide

Jen Psaki, White House Press Secretary, speaks during a press briefing in the James S. Brady Press Briefing Room at the White House in Washington, D.C., U.S., on Wednesday, Jan. 20, 2021. President Joe Biden will propose a broad immigration overhaul on his first day as president, including a shortened pathway to U.S. citizenship for undocumented migrants - a complete reversal from Donald Trump's immigration restrictions and crackdowns, but one that faces major roadblocks in Congress. Credit: Stefani Reynolds / Pool via CNP | usage worldwide

United States President Joe Biden signs executive order on Covid-19 during his first minutes in the Oval Office, Wednesday, Jan. 20, 2021. President Biden as the 46th president of the United States. Credit: Doug Mills / Pool via CNP | usage worldwide

United States President Joe Biden signs executive order on Covid-19 during his first minutes in the Oval Office, Wednesday, Jan. 20, 2021. President Biden as the 46th president of the United States. Credit: Doug Mills / Pool via CNP | usage worldwide

20 January 2021, Schleswig-Holstein, Kiel: Daniel Gunther (CDU), Minister President of Schleswig-Holstein, wears an FFP2 mask in the plenary hall of the state parliament. The state parliament discusses the Corona situation in a special session following resolutions by the federal and state governments. Photo: Axel Heimken/dpa

NYTINAUG - President Joe Biden and First Lady Dr. Jill Biden received Presidential Escort to the White House, Wednesday, Jan. 20, 2021. Photo by Doug Mills/The New York Times) Credit: Doug Mills / Pool via CNP | usage worldwide

Jen Psaki, White House Press Secretary, speaks during a press briefing in the James S. Brady Press Briefing Room at the White House in Washington, D.C., U.S., on Wednesday, Jan. 20, 2021. President Joe Biden will propose a broad immigration overhaul on his first day as president, including a shortened pathway to U.S. citizenship for undocumented migrants - a complete reversal from Donald Trump's immigration restrictions and crackdowns, but one that faces major roadblocks in Congress. Credit: Stefani Reynolds / Pool via CNP | usage worldwide

United States President Joe Biden signs executive order on Covid-19 during his first minutes in the Oval Office, Wednesday, Jan. 20, 2021. President Biden as the 46th president of the United States. Credit: Doug Mills / Pool via CNP | usage worldwide

Jen Psaki, White House Press Secretary, speaks during a press briefing in the James S. Brady Press Briefing Room at the White House in Washington, D.C., U.S., on Wednesday, Jan. 20, 2021. President Joe Biden will propose a broad immigration overhaul on his first day as president, including a shortened pathway to U.S. citizenship for undocumented migrants - a complete reversal from Donald Trump's immigration restrictions and crackdowns, but one that faces major roadblocks in Congress. Credit: Stefani Reynolds / Pool via CNP | usage worldwide

Jen Psaki, White House Press Secretary, speaks during a press briefing in the James S. Brady Press Briefing Room at the White House in Washington, D.C., U.S., on Wednesday, Jan. 20, 2021. President Joe Biden will propose a broad immigration overhaul on his first day as president, including a shortened pathway to U.S. citizenship for undocumented migrants - a complete reversal from Donald Trump's immigration restrictions and crackdowns, but one that faces major roadblocks in Congress. Credit: Stefani Reynolds / Pool via CNP | usage worldwide

Jen Psaki, White House Press Secretary, speaks during a press briefing in the James S. Brady Press Briefing Room at the White House in Washington, D.C., U.S., on Wednesday, Jan. 20, 2021. President Joe Biden will propose a broad immigration overhaul on his first day as president, including a shortened pathway to U.S. citizenship for undocumented migrants - a complete reversal from Donald Trump's immigration restrictions and crackdowns, but one that faces major roadblocks in Congress. Credit: Stefani Reynolds / Pool via CNP | usage worldwide

Jen Psaki, White House Press Secretary, speaks during a press briefing in the James S. Brady Press Briefing Room at the White House in Washington, D.C., U.S., on Wednesday, Jan. 20, 2021. President Joe Biden will propose a broad immigration overhaul on his first day as president, including a shortened pathway to U.S. citizenship for undocumented migrants - a complete reversal from Donald Trump's immigration restrictions and crackdowns, but one that faces major roadblocks in Congress. Credit: Stefani Reynolds / Pool via CNP | usage worldwide

20 January 2021, Hamburg: Ties Rabe (SPD), Senator for Schools and Vocational Training in Hamburg, speaks at a special state press conference in the Kaisersaal at City Hall. Mayor Tschentscher and Senators Fegebank and Rabe spoke on the results of the Senate meeting on further measures to contain the Corona pandemic. Photo: Christian Charisius/dpa

Poet Amanda Gorman recites one of her poems at the Inauguration ceremony of Joe Biden as the 46th US President on January 20, 2021, at the US Capitol in Washington, DC. - Biden, a 78-year-old former vice president and longtime senator, takes the oath of office at noon (1700 GMT) on the US Capitol's western front, the very spot where pro-Trump rioters clashed with police two weeks ago before storming Congress in a deadly insurrection. (Photo by Saul LOEB / POOL / AFP) | usage worldwide

U.S. Vice President Kamala Harris and husband Douglas Emhoff exchange words with former Vice President Mike Pence and wife Karen Pence on the east side steps of the U.S. Capitol after the 59th Presidential Inauguration in Washington, DC on Wednesday, January 20, 2021. Photo by David Tulis/UPI | usage worldwide

Attendees sit on the West Front of the U.S. Capitol during the 59th presidential inauguration in Washington, D.C., U.S., on Wednesday, Jan. 20, 2021. Biden will propose a broad immigration overhaul on his first day as president, including a shortened pathway to U.S. citizenship for undocumented migrants - a complete reversal from Donald Trump's immigration restrictions and crackdowns, but one that faces major roadblocks in Congress. Photographer: Kevin Dietsch/UPI | usage worldwide

United States President Joe Biden, second from left, and First Lady Jill Biden, left, join Vice President Kamala Harris, second from right and Second Gentleman Douglas Emhoff, right, as they salute and review the troops and prepare to depart the United States Capitol following their taking the Oath of Office as the 46th President and 49th Vice President of the US in Washington, DC on Wednesday, January 20, 2021. Credit: Rod Lamkey / Pool via CNP | usage worldwide

20 January 2021, Berlin: A woman walks past a sign requiring masks at the corner of Friedrichstra?e and Unter den Linden. Photo: Christoph Soeder/dpa

20 January 2021, Berlin: Loaner electric scooters stand unused at Potsdamer Platz. The federal and state governments have extended the lockdown until mid-February 2021 out of concern over viral mutation. Some rules have also been tightened. For example, the more protective FFP2 masks or surgical masks must be worn on buses and trains and when shopping. Photo: Bernd von Jutrczenka/dpa

Ivanka Trump, senior adviser to President Trump, arrives to a farewell ceremony at Joint Base Andrews, Maryland, U.S., on Wednesday, Jan. 20, 2021. Trump departs Washington with Americans more politically divided and more likely to be out of work than when he arrived, while awaiting trial for his second impeachment - an ignominious end to one of the most turbulent presidencies in American history. Credit: Stefani Reynolds / Pool via CNP | usage worldwide

United States Representative Sheila Jackson Lee (Democrat of Texas) arrives before the inauguration of Joe Biden as the 46th President of the United States on the West Front of the U.S. Capitol in Washington, U.S., January 20, 2021. Credit: Jonathan Ernst / Pool via CNP | usage worldwide

U.S. President Donald Trump speaks during a farewell ceremony at Joint Base Andrews, Maryland, U.S., on Wednesday, Jan. 20, 2021. Trump departs Washington with Americans more politically divided and more likely to be out of work than when he arrived, while awaiting trial for his second impeachment - an ignominious end to one of the most turbulent presidencies in American history. Credit: Stefani Reynolds / Pool via CNP | usage worldwide

Kamala Harris hugs her husband Doug Emhoff after she is sworn in as Vice President by Supreme Court Justice Sonia Sotomayor during the 59th Presidential Inauguration at the U.S. Capitol in Washington, Wednesday, Jan. 20, 2021. (AP Photo/Andrew Harnik, Pool) Credit: Andrew Harnik / Pool via CNP | usage worldwide

WASHINGTON, DC - JANUARY 20: United States Senate Majority Leader Chuck Schumer (Democrat of New York)., and his wife, Iris Weinshall, left, leaves the U.S. Capitol after the inauguration of President Joe Biden on January 20, 2021 in Washington, DC. Credit: Melina Mara / Pool via CNP | usage worldwide

ILLUSTRATION - 20 January 2021, Bavaria, Nuremberg: Disposable coffee cups lie on a table. Restaurants, bistros and cafes are to be obliged to offer reusable containers for their to-go products in future. This is the result of an amendment to the Packaging Act, which was discussed by the Federal Cabinet on 20.01.2021. Photo: Daniel Karmann/dpa

ILLUSTRATION - 20 January 2021, Bavaria, Nuremberg: Disposable coffee cups lie on a table. Restaurants, bistros and cafes are to be obliged to offer reusable containers for their to-go products in future. This is the result of an amendment to the Packaging Act, which was discussed by the Federal Cabinet on 20.01.2021. Photo: Daniel Karmann/dpa

Amanda Gorman recites a poem during the inauguration of Joe Biden as the 46th President of the United States on the West Front of the U.S. Capitol in Washington, U.S., January 20, 2021. REUTERS/Jonathan Ernst | usage worldwide

Former Vice President Dan Quayle, left, shakes hands with former Vice President Mike Pence, right, as House Minority Leader Kevin McCarthy of Calif., center, looks on after attending the 59th Presidential Inauguration at the U.S. Capitol in Washington, Wednesday, Jan. 20, 2021. (AP Photo/Susan Walsh, Pool) | usage worldwide

Former President Barack Obama gives a thumbs up after the 59th Presidential Inauguration at the U.S. Capitol in Washington, Wednesday, Jan. 20, 2021. (AP Photo/Patrick Semansky, Po | usage worldwide

From l-r., former first lady Michelle Obama, former President Barack Obama, Sen. Chuck Schumer of N.Y., his wife Iris Weinshall, former Vice President Mike Pence, his wife Karen Pence, and House Speaker Nancy Pelosi of Calif., on stage after attending the 59th Presidential Inauguration at the U.S. Capitol in Washington, Wednesday, Jan. 20, 2021. (AP Photo/Susan Walsh, Pool) | usage worldwide

President Joe Biden is congratulated by First lady Jill Biden and his family, after being sworn-in during the 59th Presidential Inauguration at the U.S. Capitol in Washington, Wednesday, Jan. 20, 2021.(AP Photo/Patrick Semansky, Pool) | usage worldwide

Hunter Biden attends his father Joe Biden's inauguration as the 46th President of the United States on the West Front of the U.S. Capitol in Washington, U.S., January 20, 2021. REUTERS/Jonathan Ernst/Pool | usage worldwide