Cosmic impact wiped out mammoths

A study of rocks in Pennsylvania, South Carolina and Syria provides powerful support for the theory that a major impact helped wipe out mammoths and other megafauna, and destroyed a major prehistoric culture.

Team solves mystery of 'megafauna' extinctions

The long-ago extinctions of some of the world's largest animals were caused by both human activity and natural climate change, according to new research from the University of Cambridge.