Anthropologist Chris Stringer of the Natural History Museum in London talks about Neandertals. And Scientific American 's Kate Wong, co-author with Donald Johanson of Lucy's Legacy, talks about the discovery and impact of the famous Lucy fossil. Plus, we test your knowledge of some recent science in the news. Web sites related to this episode include www.snipurl.com/lucyfinder; http://bit.ly/bntu0