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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.