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Did you know?

Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.

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For high blood pressure (hypertension), a new class of drug, called a vasopeptidase blocker (inhibitor), has been developed. It decreases blood pressure by simultaneously dilating the peripheral arteries and increasing the body's loss of salt.

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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.

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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.

Tonsils—normal and enlarged. Tonsils—normal and enlarged.
Bell’s palsy, showing typical drooping of one side of the face. Bell’s palsy, showing typical drooping of one side of the face.
Thumb web–forearm stimulation. Using the thumb and finger of your left hand, squeeze the webbing ... Thumb web–forearm stimulation. Using the thumb and finger of your left hand, squeeze the webbing ...
(mn/p) = 6 . How do you manipulate the equation so that you isolate m on one side? (mn/p) = 6 . How do you manipulate the equation so that you isolate m on one side?
A comparison of a normal erythrocyte with sickle-cell anemia A comparison of a normal erythrocyte with sickle-cell anemia
Birds-eye view of land Birds-eye view of land
Video: How do the different types of chromatography work? (No Audio)

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