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NASA The Trick to Finding Life on Distant Planets
Is oxygen in an exoplanet's atmosphere a sign of living beings, or something more mundane?
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Reporter#7619314 / Demotix / Corbis Nature's Warning Signal
Complex systems like ecological food webs, the brain, and the climate all give off a characteristic signal when disaster is around the corner.
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Christian Charisius / Reuters Physicists and Philosophers Hold Peace Talks
If only for three days
