In Ancient Oregon Dump, Clues to the First Americans?

"Some of the most interesting discoveries in archaeology come from sifting through ancient garbage dumps. Scientists working in Oregon have found one that has yielded what they say are the oldest human remains in the Americas and a puzzle about the earliest American tools."

"Early Americans used Oregon's Paisley Caves for, among other things, a toilet. Little did they know that scientists would be picking through what they left behind."

"The scientists extracted DNA from dried-up feces in the cave, known politely as 'coprolites.' And they've got something more — four projectile points, flaked from stone and presumably used for weapons. They're broken; their makers probably trashed them."