The Wild's Creeping Killer; Scientists Are Concerned About Cancer in Animals

In 1999, wildlife disease specialist Thierry Work looked over the bow of his small whaler as it cut through a lagoon on the south side of Molokai, an island in Hawaii. On an emergent rock he saw a listless sea turtle, waiting to die. "This guy was so weak that he just let us pick him up," says Work, who runs the National Wildlife Health Center's Honolulu field station...