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Scientific American Magazine 3/19/10
Boundaries for a Healthy Planet
Scientists have set thresholds for key environmental processes that, if crossed, could threaten Earth's habitability. Ominously, three have already been exceeded
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Innovation is the key to a better future. Enter your own World Changing Ideas videos in our contest. For examples, see "World Changing Ideas," Scientific American; December 2009.
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Illusions: Colors Out of Space [Slide Show]This is the 11th article in the Mind Matters series on the neuroscience behind visual illusions
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