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Vaccines prevent between 2.5 and 4 million deaths every year.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).