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Did you know?

Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

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There are more nerve cells in one human brain than there are stars in the Milky Way.

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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.

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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.

Negative control of a repressible set of genes: function of the trp repressor and corepressor in reg Negative control of a repressible set of genes: function of the trp repressor and corepressor in reg
Gram-positive and Gram-negative bacteria. Gram-positive and Gram-negative bacteria.
coagulase negative Staphylococcus on Blood agar coagulase negative Staphylococcus on Blood agar
Gram negative flowchart Gram negative flowchart
Schedules of Reinforcement Schedules of Reinforcement
Positive and negative selection during T-cell development. Positive and negative selection during T-cell development.
Video: First Stage of Labor and Delivery Video

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