The wheel is one of the earliest human inventions.
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Some insects can lift many times their body weight.
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A sea anemone uses stinging cells to capture prey.
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Some fish can survive in near-freezing water.
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Extreme droughts can last for years.
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The Earth's core generates geothermal heat.
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The Earth's inner core is solid despite extreme heat.
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Ankylosaurus had a heavily armored body and a clubbed tail.
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The Earth's outer core is liquid metal.
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