The first use of biological warfare occurred in 1346 when Mongols catapulted plague-infected bodies into Caffa.
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The Earth is not perfectly round.
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The Earth's magnetic poles slowly shift over time.
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The FIFA World Cup is held every four years.
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Fingernails grow faster than toenails.
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Rats can learn complex maze patterns quickly.
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The human heart beats over 100,000 times per day on average.
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Pacemakers help regulate abnormal heart rhythms.
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The use of defibrillators can restore normal heart rhythm.
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