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Life

Yawning helps lions synchronize their groups’ movements

A lion yawn is contagious, and when lions start yawning together, they start moving together. Synchronization may be key for group hunters like lions.

Tech

‘Pipe Dreams’ flushes out hope in an unexpected place: the toilet

A new book shows how reimagined toilets will allow humans to use pee and poop as natural resources.

Earth

A spike in Arctic lightning strikes may be linked to climate change

Global warming may be revving up summer thunderstorms in the Arctic, leading to skyrocketing numbers of lightning strikes.

Humans

New depictions of ancient hominids aim to overcome artistic biases

Artists’ intuition instead of science drive most facial reconstructions of extinct species.