It’s been over 150 years since "On the Origin of Species" was published, but we’re still fighting over Charles Darwin’s big theory. One of Darwin's descendants, Ruth Padel, writes poems about her famous relative. Spencer Wells gathers DNA around the world to determine where we came from. An amateur paleontologist finds a way to believe in both God and the fossil record. Plus, a science fiction story by Lydia Millet imagines the downside of messing too much with our genes.

(Originally aired November 20, 2009)