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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
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According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.