Bloodletting was practiced for over 2,500 years — it likely killed as many patients as it helped.
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Ancient Mesopotamia is often called the cradle of civilization.
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The Boston Tea Party took place in 1773.
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The ancient Egyptians developed a 365-day calendar.
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Mammoths and early humans lived at the same time.
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In 2002, scientists recreated ancient pigments to understand historical art techniques.
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