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Four Scientific American editors comment on President Barack Obama's 2011 State of the Union address. His speech touched on topics like technology, green energy sources, health care and innovation.
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Autonomous Attack Drone Flies into History
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SA editors on Obama's "State of the Union"
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Missing Mars Lander Found? - The Countdown #20
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What Color Were Dinosaurs? - Instant Egghead
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Are We Alone in the Universe? - Instant Egghead
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Instant Egghead - Comets versus Asteroids
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