A former resident of Pripyat hangs a photo of the city before the explosion by the sign 'Happy Birthday' as people celebrate the 50th anniversary of the city in Pripyat, not far from the Chernobyl nuclear power station, Ukraine, Tuesday, Feb. 4, 2020. It was the first time some former residents had returned to the city since their evacuation after the world's worst nuclear accident. Once home to some 50,000 people whose lives were connected to the Chernobyl nuclear power plant, Pripyat was hastily evacuated one day after a plant reactor exploded on April 26, 1986. (AP Photo/Efrem Lukatsky)