Photo illustration of the periodic table of the elements, with a piece of laboratory glassware (showing a diagram of atomic structure) and its reflection in the foreground.

Photo illustration of the periodic table of the elements, with a piece of laboratory glassware showing a diagram of atomic structure and a reflection in the foreground.

Photo illustration of the periodic table of the elements with bottles for sulfuric and hydrochloric acid.

Photo illustration of a periodic table of the elements with laboratory glassware.

Photo illustration of the concept of scientific discovery: a hand holding a glowing test tube.

Photo illustration of the concept of scientific discovery: a hand holding a glowing test tube.

Photo illustration of the concept of scientific discovery: a hand holding a glowing test tube.

Photo illustration of the concept of biochemical research and development.

Hand arranging building blocks, with each block representing one of the elements.

Hand arranging building blocks, with each block representing one of the elements.

Conceptual image of a globe encased in laboratory glassware.

Special effect image of laboratory glassware.

Laboratory glassware surrounding three stacked blocks labeled with chemical elements and their symbols, all on a reflective surface.

Man under a microscope.

Molecular model of ethanol.

Polymer carbon chains doped with ionic triplets showing that plastic can conduct electricity.

Molecular structure of ferredoxin, an acidic, iron-sulfur protein in a flask. Ferredoxins are involed in electron transfer.