Your brain filters out most sensory information.
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There are more possible shuffles of a deck of cards than seconds since Earth formed.
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The human body has over 600 muscles.
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The human body glows faintly in complete darkness.
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The human heart has four chambers.
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Water is the only natural substance that commonly exists as a solid, liquid, and gas on Earth.
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In 1953, Watson and Crick described the double-helix structure of DNA.
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Extreme droughts can last for years.
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Tyrannosaurus rex had teeth that could grow over 12 inches long.
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