Extreme cold may have nearly wiped out human ancestors 900,000 years ago
Ancestral populations rebounded by about 100,000 years later, a contested DNA analysis suggests
Modern human DNA indicates that human ancestors may have brushed up against extinction starting around 900,000 years ago before bouncing back and possibly evolving into Homo heidelbergensis, a species represented by the African fossil skull shown here.
RYAN SOMMA/FLICKR (CC BY-SA 2.0)