A thin layer of clay in Italy, unusually rich in iridium, revolutionized the understanding of dinosaur extinction. This rare element, abundant in meteorites, pointed to a massive extraterrestrial ...

This extinction was connected with massive volcanic eruptions caused by the breakup of the supercontinent Pangaea. The volcanism pumped greenhouse gases into the atmosphere, acidified the oceans, and ...

(CNN) — No species lasts forever — extinction is part of the evolution of life. But at least five times, a biological catastrophe has engulfed the planet, killing off the vast majority of species from ...

Homo sapiens’ interconnected networks gave them a survival edge over more isolated Neanderthals amid environmental changes.