The president jumps the shark.

Long-banned pollutants called PCBs could wipe out many orca groups within the next century.

A shocking sequence shows the huge mammals scaling steep cliffs, then falling to their death.

A great mud boom 400 million years ago changed features such as the shape of rivers and the planet’s biodiversity.

Twenty-five of the endangered rodents are living on top of a multibillion-dollar Chilean gold reserve. Miners are going to great lengths to relocate them.

They lure their prey with the promise of sex and then kill them cold.

Yes, they can.

Healthy birds watched their friends get sick with a bacterial disease. Their immune cells freaked out.

Photosynthesis is about the plantiest thing on Earth. The little green thieves manage to pull it off anyway.