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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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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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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 ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.