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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The horizontal fraction bar was introduced by the Arabs.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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In 1864, the first barbiturate (barbituric acid) was synthesized.