SHARE THIS VIDEO —
Early human fossils found in South African cave dated one million years older than suspected
Fossils of early human ancestors found in South African caves are now thought to be between 3.4 to 3.6 million years old, one million years older than previously suspected. NBC News’ Isa Gutiérrez looks at a new fossil dating technique created by a geology professor at Purdue University and a team of international scientists.