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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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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 1864, the first barbiturate (barbituric acid) was synthesized.
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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The average office desk has 400 times more bacteria on it than a toilet.