Exploration, for July 19, 2005 - 2:00pm
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Science news 1) A split seems to be developing among environmentalists whether nuclear power can save us from global warming 2) The space shuttle is delayed again, raising the question: do we really need one? 3) A new planet has been discovered orbiting a triple star system 4) Scientists can reverse a form of Alzheimer's in mice; Special Guest: Dana Mackenzie, author of the Big Splat, about the origin of the moon.