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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.

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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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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).

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Over time, chronic hepatitis B virus and hepatitis C virus infections can progress to advanced liver disease, liver failure, and hepatocellular carcinoma. Unlike other forms, more than 80% of hepatitis C infections become chronic and lead to liver disease. When combined with hepatitis B, hepatitis C now accounts for 75% percent of all cases of liver disease around the world. Liver failure caused by hepatitis C is now leading cause of liver transplants in the United States.

A soil surface crust that includes nitrogen-fixing, soil-enriching cyanobacteria. A soil surface crust that includes nitrogen-fixing, soil-enriching cyanobacteria.
Proper Hand Washing Proper Hand Washing
Typical Mendelian pattern of inheritance of HLA haplotypes includes children AC, BC, AD, and BD. ... Typical Mendelian pattern of inheritance of HLA haplotypes includes children AC, BC, AD, and BD. ...
Apply passive touch over the eyes and cheeks to finish. Place the hands, using very light pressure, ... Apply passive touch over the eyes and cheeks to finish. Place the hands, using very light pressure, ...
Place the infant faceup on a soft surface, such as a towel, and remove his or her clothing. With one ... Place the infant faceup on a soft surface, such as a towel, and remove his or her clothing. With one ...
Apply L stroke on terminus. Place your index and middle fingers on the left and right terminus; ... Apply L stroke on terminus. Place your index and middle fingers on the left and right terminus; ...
Video: Introduction to Herpes

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