Earth formed about 4.5 billion years ago.
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The human brain operates on about 20 watts of power.
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The human body contains trillions of cells.
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Some insects have compound eyes made of many lenses.
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The Earth's rotation is gradually slowing over time.
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The fangtooth fish has some of the largest teeth relative to body size in the ocean.
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Extreme droughts can last for years.
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The Earth's magnetic poles slowly shift over time.
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The Tyrannosaurus rex may have had excellent vision.
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