Each person is a mosaic of sex-related and postpubertal biological traits that vary in their degree of femaleness and maleness.

A young bonnethead shark carries a feature that appears to fade with age: a sharply defined point at the front of its ...

For two years running, the Gravelines nuclear power plant in northern France has had to reduce and shut down units of operation due to the arrival of swarms of jellyfish. On August 11, 2025, the ...

The world’s oceans cover 71% of Earth, yet organizing marine life into clear biological regions is far harder than doing the same thing on land. This video explores the 12 marine realms used to ...

Scientists probing life’s deepest origins have uncovered evidence that the first free-living cells may have emerged not once, but twice. The findings suggest a striking possibility: life may share one ...