40,000-yr human footprints in Mexico

British scientists on Tuesday claimed to have unearthed 40,000 year-old human footprints in central Mexico, challenging previous studies that put the arrival of the first humans in the Americas at......

Lake under Antarctica mapped

A massive lake buried under four kilometers of ice in the middle of Antarctica has been mapped by scientists using ice-penetrating radar. 'The lake is called Vostok, and for the first time,......