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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").

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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.

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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.

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