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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.