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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

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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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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.

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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

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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.

Ivory trade in East Africa during the 1880s and 1890s Ivory trade in East Africa during the 1880s and 1890s
Structures of the external ear, middle ear, and inner ear Structures of the external ear, middle ear, and inner ear
(a) Masai from East Africa have body types adapted to warm climates. (a) Masai from East Africa have body types adapted to warm climates.
Joseph Moore and His Family (1839), by Erastus Salisbury Field, reflects the emerging middle-class f Joseph Moore and His Family (1839), by Erastus Salisbury Field, reflects the emerging middle-class f
Adults in the middle-aged group (37–42 years) score higher on measures of generativity than either ... Adults in the middle-aged group (37–42 years) score higher on measures of generativity than either ...
Middle age brings greater career satisfaction than young adulthood, sometimes through major job ... Middle age brings greater career satisfaction than young adulthood, sometimes through major job ...
Video: Status Epilepticus

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