The human brain contains about 86 billion neurons.
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Rats can learn complex maze patterns quickly.
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The Earth's inner core is solid despite extreme heat.
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Ankylosaurs had armored bodies and clubbed tails.
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The fennec fox has large ears that help dissipate heat.
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The learned helplessness theory explains passivity after repeated failure.
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Many insects have exoskeletons that protect them from dehydration.
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Dust storms can reduce visibility to near zero.
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