According to a study by the National Science Foundation, only half of Americans believe in evolution, and one in 4 don't know that the Earth orbits the Sun.
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The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
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Pluto is smaller than Russia.
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MDIF, a New York based non-profit organisation, is planning to beam free Wi-Fi to the entire world from space.
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