There are 20 feet of blood vessels in each square inch of human skin.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Patients should never assume they are being given the appropriate drugs. They should make sure they know which drugs are being prescribed, and always double-check that the drugs received match the prescription.
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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
Water striders serve as a model organism for the study of sexual conflict between males and females.
While numerous subspecies of the jaguar have been recognized, recent research suggests just three. G
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