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Did you know?

All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.

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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.

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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.

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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.

Some of the bacteria that can fix atmospheric nitrogen, converting it into a form usable by plants. Some of the bacteria that can fix atmospheric nitrogen, converting it into a form usable by plants.
A complete cranium of Au. Afarensis from Hadar, Ethiopia, shows a prognathic face and a small brainc A complete cranium of Au. Afarensis from Hadar, Ethiopia, shows a prognathic face and a small brainc
Nitrogen fixation Nitrogen fixation
An angiogram that illustrates narrowing of the carotid artery (see arrow), the main pathway of blood ... An angiogram that illustrates narrowing of the carotid artery (see arrow), the main pathway of blood ...
Competitive enzyme immunoassay. (a) Shows the uninhibited reaction and (b) shows the inhibited ... Competitive enzyme immunoassay. (a) Shows the uninhibited reaction and (b) shows the inhibited ...
Poison Arrow Frog Poison Arrow Frog
Video: Skin Cancer

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