The world's oldest living tree is a bristlecone pine in California named Methuselah — it is over 4,800 years old.
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The human brain operates on about 20 watts of power.
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Hyenas have powerful jaws adapted for crushing bone.
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The barreleye fish has a transparent head and upward-facing eyes.
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Certain sea slugs can incorporate stinging cells from their prey.
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The human brain contains roughly 86 billion neurons.
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The learned helplessness theory explains passivity after repeated failure.
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A horned lizard can squirt blood from its eyes as a defense.
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Extreme droughts can last for years.
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