Chief, Astroparticle Physics Laboratory, NASA Goddard Space Flight Center
Neil Gehrels, Principal Investigator for the Swift Mission, returns to tell us about the most distant event ever observed, a Gamma Ray Burst more than 13 billion light years away. Bill Nye reports from the side of Mount St. Helens. Bruce Betts and Mat Kaplan salute the 40th anniversary of Apollo 10, talk about the night sky, and invent space tissues. Also, a new space trivia contest.