On average, the stomach produces 2 L of hydrochloric acid per day.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
Some dogs, like this Tamaskan, look very much like wolves.