A pile of ancient arrowheads from southern Africa still holds traces of toxic plant residue, even after some 60,000 years.

A: Circumstantial evidence does not directly prove an element of the alleged misconduct, but provides information from which ...

A fascinating archaeological discovery in South Africa has revealed that humans were using sophisticated poisoned arrows 60,000 years ago, far earlier than previously documented. Chemical analysis of ...

Researchers have combined physics and biology in a study that provides the first direct evidence explaining why we sleep. Viewing the brain like a biological computer whose resources are drained ...