Large amounts of oxygen released by ocean plankton made breathable atmosphere on Earth for the first time in history. This happened about 500 million years ago.
Ancient human populations lived on islands rife with natural disasters. From their early settlements, we're learning about human endurance in a difficult and uncertain world.
DNA analysis is changing the way we classify fish. A recent Smithsonian study of fish thought to be three species of Starksia blennies were actually ten different species, seven of which were hiding in plain sight.
Shireen Gonzaga is a freelance writer who enjoys writing about natural history. She is also a technical editor at an astronomical observatory where she works on documentation for astronomers.