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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
Did you know?
In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
Did you know?
Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
Did you know?
Approximately 500,000 babies are born each year in the United States to teenage mothers.