The 'out-of-Africa' hypothesis holds that all living humans descended from ancestors who left Africa ~70,000 years ago.
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Some animals sleep for years.
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The human body glows faintly in complete darkness.
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The Sumerians developed one of the earliest writing systems.
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The Arctic hare has short ears to minimize heat loss.
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The Human Genome Project mapped the entire human genetic sequence.
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The steam engine powered early industrial machinery.
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The human heart pumps blood through the circulatory system.
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Certain fish can inflate their bodies to appear larger.
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