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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.