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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.

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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.

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In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.

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Street names for barbiturates include reds, red devils, yellow jackets, blue heavens, Christmas trees, and rainbows. They are commonly referred to as downers.

Change in Drawing Abilities from Early to Middle Childhood Drawings become more realistic as fine m Change in Drawing Abilities from Early to Middle Childhood Drawings become more realistic as fine m
In 2006 an Iraqi tribunal convicted Saddam Hussein of murdering his own people and sentenced him to In 2006 an Iraqi tribunal convicted Saddam Hussein of murdering his own people and sentenced him to
With tough economic times, a lot of people have lost their jobs—and their homes. If this happens, ... With tough economic times, a lot of people have lost their jobs—and their homes. If this happens, ...
For millions of people, the United States represents a land of opportunity and freedom from ... For millions of people, the United States represents a land of opportunity and freedom from ...
By the People: A History of the United States, AP Edition By the People: A History of the United States, AP Edition
Collage of people showing emotions Collage of people showing emotions
Video: Acid-base imbalances - metabolic acidosis and alkalosis

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