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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

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Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

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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.

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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.

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Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.

Common spotted cuscus Common spotted cuscus
Neural Tissue Diagram Neural Tissue Diagram
Common skin signs are often evidence of an illness or disorder. A wheal is a localized, evanescent ... Common skin signs are often evidence of an illness or disorder. A wheal is a localized, evanescent ...
The blood cells are shown in (a)–(f) and the tissue white blood cells are shown in (g), (h), and ... The blood cells are shown in (a)–(f) and the tissue white blood cells are shown in (g), (h), and ...
Stress and the Common Cold Stress and the Common Cold
This ciliated protozoan is a Stentor. Stentor are common in freshwater lakes and rivers This ciliated protozoan is a Stentor. Stentor are common in freshwater lakes and rivers
Video: Evolutionary tree of life Animation

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