9+ hour, 40+ min ago   (555+ words) WASHINGTON - Footprints are among the most common kind of dinosaur fossils. Sometimes scientists find a single, lonely footprint. Sometimes they come across a chaotic jumble of tracks resembling a dance floor, sort of a dinosaur discotheque. But identifying which dinosaur…...

5+ mon, 3+ week ago   (707+ words) Researchers have unearthed tooth fossils in Ethiopia dating to about 2.65 million years ago of a previously unknown species in the human evolutionary lineage, one that lived in the same time and place as the earliest-known member of the genus Homo…...

6+ mon, 4+ week ago   (572+ words) WASHINGTON -Scientists in recent years have made progress in findingancientDNA infossils, gaining insight into organisms that lived long ago. But theoldest DNAobtained so far dates back about two million years.Proteins, a cell's molecular machinery, also offer valuable information and…...