The human eye moves about 100,000 times per day — the muscles that move it are the most active in the body.
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A narwhal’s tusk is actually an elongated tooth.
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The Moon was formed billions of years ago.
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Octopuses have three hearts and blue blood.
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The Arctic hare has short ears to minimize heat loss.
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The eruption of Krakatoa in 1883 was heard thousands of miles away.
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A sloth can take up to a month to digest a single meal.
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Practice can strengthen neural pathways in the brain.
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Some insects can lift many times their body weight.
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