145 Million-Year-Old Rat Teeth Offer Clues On Origins Of Modern Mammals A student recently uncovered two ancient teeth in England that belong to rat-like creatures that lived 145 million years ago. Scientists say the creatures are the oldest known ancestors of modern mammals, including human beings. by Sami Ghanmi
Science 14,000-Year-Old Mammoth Skeleton Discovered In Mexico City During A Drain Installation by Katherine Derla