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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

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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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The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.

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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.

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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

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Burial caves from Mangaia, Cook Islands, document the changing patterns of mortuary ritual. Burial caves from Mangaia, Cook Islands, document the changing patterns of mortuary ritual.
A typical office file room. (Paper medical records are rapidly being replaced by electronic ... A typical office file room. (Paper medical records are rapidly being replaced by electronic ...
Tickler file using a file drawer. Tickler file using a file drawer.
Heavy fuel droplets separate as they flow around an abrupt bend in an intake manifold. Heavy fuel droplets separate as they flow around an abrupt bend in an intake manifold.
Segregation of two genetic markers, lying on separate chromosomes (top) or on the same chromosome Segregation of two genetic markers, lying on separate chromosomes (top) or on the same chromosome
Video: Resting membrane potential - electrical polarity and maintenance requirements

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