There are more sensory neurons in the tongue than in any other part of the body.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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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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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
