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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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Cyanide works by making the human body unable to use oxygen.

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The U.S. Pharmacopeia Medication Errors Reporting Program states that approximately 50% of all medication errors involve insulin.

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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

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