Back in the early 1950s, some scientists were digging in a cave in the Amazon Rainforest. One scientist made a remarkable discovery. A skeleton was found that was very long and thin and looked vaguely like that of a human. After bringing the skeleton back to America, the scientists discovered that it had the same DNA as modern humans. There are thought to be several members of the unknown species remaining. As of now, scientists believe that the skeleton is the ancestor of all modern humans. If you see a tall, thin man, do not run in fear. He only wants to give you a hug.