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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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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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In 1864, the first barbiturate (barbituric acid) was synthesized.