Oxygen
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Photosynthesis caught in action with latest X-ray flashlight
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Genetic mutation in Tibetans helps them thrive in high altitudes
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Space bling: White dwarf star may have crystallized into super-massive diamond
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Moon was born when Earth and Theia smooched 4.5 billion years ago
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Our ancestor was a sponge. No, really
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Photosynthesis protein developed long before oxygen became available
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