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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.

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In 1864, the first barbiturate (barbituric acid) was synthesized.

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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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Though “Krazy Glue” or “Super Glue” has the ability to seal small wounds, it is not recommended for this purpose since it contains many substances that should not enter the body through the skin, and may be harmful.

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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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