Dr. Louis S.B. Leakey, noted scientist, displays piece of stone unearthed eight months ago in the Mojave Desert which he says shows that man migrated to North America 30,000 to 80,000 years earlier than previously believed. "Man has been in America for more than 50,000 years", Leakey told newsmen in Los Angeles October 27, 1970. (AP PHOTO)