According to evolution, eons ago mere ingredients like mud, minerals, and methane somehow made themselves into some single-celled bacteria…some of those bacteria became worms, and some of the worms eventually became people. A newly described out-of-place fossil confronts this origins myth.

A portion of a fossilized dinosaur upper arm bone from Tanzania, originally collected in the 1930s, spent many years nestled among thousands of dinosaur specimens housed at London's Natural History Museum. Re-examined, researchers now claim that it is the oldest dinosaur—or almost a dinosaur—in the world.

Well, was it a dinosaur or not?