Astronomer Phil Plait has become one of bad astronomy's (and bad science's) worst enemies. Which bogus stories are bugging him most right now? Emily Lakdawalla previews April activity by missions around the solar system. Bill Nye celebrates the first data-based estimate of Earth-like planets. Bruce Betts joins Mat from Virginia where he is helping to prepare micro-organisms for spaceflight. Here's the new space trivia contest.