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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.