Astropulse: A New Way for ET to Phone Home

SETI@home Chief Scientist Dan Werthimer returns to tell us about a new search now underway on many of SETI@home's one million computers. Astropulse is looking for signals that may reach us as quick, broad pulses of radio energy. Bill Nye the Science and Planetary Guy looks at the space shuttle and human spacecraft plans around the world. Emily Lakdawalla's Q&A solves a somewhat counterintuitive observation on Mars, and Bruce Betts reviews his Space Food Stick for Mat Kaplan as he scans the night sky in What's Up! A new space trivia contest opens.