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Your heart beats over 36 million times a year.
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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.
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Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.