When a stone sits on the Earth’s surface, cosmic rays quietly pepper it, leaving behind rare isotopes like tiny time stamps.

Researchers have identified a "tipping point" about 2.7 million years ago when global climate conditions switched from being relatively warm and stable to cold and chaotic, as continental ice sheets ...

Early humans may have created fire 400,000 years ago, according to evidence unearthed at an archaeological site in England. Although there is evidence that early humans used natural fire in Africa as ...