Remember how scientists discovered alien-esque life forms in California and the Internet was all, "Oh, sheeeet!" But then other scientists started critiquing the research and there was a giant debate about whether one scientist could call out another scientist for bad data on a blog, rather than in a peer-reviewed journal, except that the peer reviewed critiques basically said the same thing and the "discovery" turned out to be totally incorrect? I'm making light of arsenic life here just a bit, but this story of de-discovery continues to be interesting and important. Today, on NPR's Science Friday, science journalist extraordinaire Carl Zimmer will explain why, and will talk about what happens when scientists are wrong.