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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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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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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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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Vaccines prevent between 2.5 and 4 million deaths every year.