It's arguably the most famous tongue-twister: Sally sells seashells by the seashore. But this sentence wasn't just randomly assembled to trip up your tongue. The Sally in this case was based on a real woman named Mary Anning. She has been called one of the greatest fossilists of all time, and the story comes from Anning's hobby of selling rare invertebrate fossils by the seashore. Born in 1799, Anning was a paleontologist who discovered the first complete ichthyosaurus. The fossil was 200 million years old, and Anning was only 12.