The mystery of how related flightless birds ended up so far apart on different continents may have been solved.

Earth shook with the force of a supervolcano — the Toba eruption in present-day Indonesia. It spewed 2,800 km³ of ash, darkened skies, cooled the planet, and poisoned the land. For decades, scientists ...

Learn about the comet impact hypothesis that may explain why North America lost most of its megafauna along with the Clovis ...