For decades, scientists believed modern humans descended from a single ancestral lineage. However, new research has not only challenged this view, it has simultaneously spawned a new mystery ...

We’ve long known the short-term effects of trauma — headaches, changes in appetite or sleep, fear, anxiety and concentration troubles are just a few. A new study suggests that severe trauma ...

All modern humans share DNA from two ancient populations that split 1.5 million years ago and reunited through interbreeding about 300,000 years ago. The genetic mixture is approximately 80% from one ...