Scott Hubbard and John Logsdon led the Humans Orbiting Mars Workshop last spring. They return with Casey Dreier as the report on that workshop is released to the world. Emily Lakdawalla sizes up NASA’s announcement about water on the surface of Mars right now. Bill Nye calls us on his way toward the Crimson Tide. Bruce Betts honors some big events in space history in our What's Up segment this week.