There's no physical evidence that the family who gave the Donner Party its name had anything to do with the cannibalism the ill-fated pioneers have been associated with for a century and a half, two scientists said Thursday. Cannibalism has been documented at the Sierra Nevada site where most of the Donner Party's 81 members were trapped during the brutal winter of 1846-47, but 21 people, including all the members of the George and Jacob Donner families, were stuck six miles away because a broken axle had delayed them. No cooked human bones were found among the thousands of fragments...