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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

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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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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.

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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.

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Blood is approximately twice as thick as water because of the cells and other components found in it.

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