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A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.
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Cyanide works by making the human body unable to use oxygen.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.