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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.