Fusulines thrived in cold seas but vanished twice when warming from volcanoes rapidly spiked ocean carbon levels.

Cooper were preoccupied with fresh and varied ideas, anything related to "SG-1" automatically took precedence, as this ...

Footprints found in the ancient lakebeds of White Sands may prove that humans lived in North America 23,000 years ago — much earlier than previously believed. A new study using radiocarbon-dated mud ...