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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Asthma cases in Americans are about 75% higher today than they were in 1980.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
Growth of yeast cells in culture fits the logistic growth model.