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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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The average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.