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Did you know?
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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Colchicine is a highly poisonous alkaloid originally extracted from a type of saffron plant that is used mainly to treat gout.