About 117 billion humans have lived on Earth.
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Learning involves changes in neural connections.
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Multitasking often reduces overall task performance.
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The pacemaker regulates irregular heartbeats.
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Giraffes have high blood pressure to pump blood to their brains.
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Hippopotamuses secrete a reddish fluid that helps protect their skin.
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Early humans hunted megafauna during the Ice Age.
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The Earth's magnetic poles slowly shift over time.
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Many insects have exoskeletons that protect them from dehydration.
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