University of Texas at Austin researcher says the first Americans arrived earlier than previo Schoolchildren can recite the story of the first Americans. About 12,000 years ago, prehistoric humans walked out of Siberia, trekked across the Bering land bridge and down an ice-free corridor into inner North America, where they hunted Ice Age elephants and peopled the new world. But mounting evidence is slowly turning that story to fiction, said Michael Collins, an archaeologist with the Texas Archaeological Research Laboratory at the University of Texas at Austin. For more than 20 years, Collins and other scientists have been digging up...