Name that skull

The Smithsonian National Museum of Natural History has a great website on human origins. It is a treasure trove of information on human and primate evolution including a 3D digital collection of many artifacts and fossils. My favorite feature is the Mystery Skull Interactive which gives you a set of skulls and asks you to identify them by comparing them side-by-side with skulls that are already known. It is a great way to highlight the meticulous attention to detail that paleontologists and anthropologists need to have to be able to correctly identify fossils.