The Indus Valley Civilization had grid-planned streets and sophisticated sewage systems 4,500 years ago.
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The human heart beats over 100,000 times per day on average.
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Learning involves changes in neural connections.
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The saber-toothed tiger is more accurately called Smilodon.
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In 1809, two countries declared war and then forgot to sign a peace treaty for years.
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An African elephant's ears help regulate its body temperature.
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The Dead Sea is one of the saltiest bodies of water on Earth.
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The human body produces heat through metabolism.
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The brain named itself.
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