Doyle Rice
400,000-year-old teeth suggest Neanderthals and humans split much earlier than thought
Our distant cousins just got a little more distant. A new study suggests that modern humans and our closest relatives, the Neanderthals, ...
Bad weather, habitat destruction and pesticides are main threats to monarch butterflies
The number of monarch butterflies that overwintered in forests in Mexico fell for a second straight year, experts say. Monday's ...