Scientists studying fossil human footprints in New Mexico say their age implies that humans arrived in North America earlier than thought. NPS Photo How long have humans lived on the American conti… [+5206 chars]
When its all done, the full stack of the Space Shuttle launch system will stand 200 feet (61 meters) tall, becoming the
TOKYO As China's economy continues to grow at a slower pace than in recent decades, Chinese businesses and households ar
When Meiklejohn started college at Brown in 2004, she discovered cryptography. This branch of computer science appealed
