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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.

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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.

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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.

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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.

Bartel and Szostak demonstrated chemical selection for RNA molecules that can catalyze phosphoester Bartel and Szostak demonstrated chemical selection for RNA molecules that can catalyze phosphoester
Herbivores must overcome the wide variety of physical and chemical defences evolved by plants. Herbivores must overcome the wide variety of physical and chemical defences evolved by plants.
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As a nerve impulse arrives at the synapse, it triggers the release of a chemical neurotransmitter fr As a nerve impulse arrives at the synapse, it triggers the release of a chemical neurotransmitter fr
Video: Uterine (menstrual) cycle - phases

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