The Aztecs didn't discover obsidian. It was already the most common raw material in Mesoamerica when they arrived in the ...

A study of more than 3,000 genomes has traced a gene mutation that confers HIV resistance to a person who lived near the ...

The elephant bird that lived in Madagascar reached up to 1,600 pounds or about five times the size of the largest ostriches. Believe it or not, these gigantic birds only went extinct about 1,000 years ...