For a long time, scientists looked for the "missing link" that would prove that humans evolved from apes. This missing link would be a midpoint between ape and human. But there's no "midpoint" because that's not how evolution works. We can't even come to an agreement about what "human" really means on the evolutionary scale. The story Piltdown man is only one chapter in the long story of how scientists unfolded the evolutionary history of humans.