Humans have spent centuries shaping the world. But nature wouldn’t hesitate to take over if we suddenly disappeared. Cities ...

For most of Earth’s history, ice has been a rarity. Yet, modern humans evolved during an unusually cold period in the planet’s past. As climate change accelerates, melting ice caps and rising ...

Humans didn't evolve 'early' or 'late' in Earth's history, but 'on time,' when the conditions were in place. Perhaps it's only a matter of time, and maybe other planets can achieve these ...

We’re living in a weird time on Earth: a period when our planet has ice. Amid persistent and frequent record heat, it may be surprising to hear that Earth is currently relatively cool — at ...

For one, without the stress of Earth's gravity ... there's a good chance that one day humans will give birth somewhere beyond Earth, and that brings up some interesting questions.