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Did you know?

Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

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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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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

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Illicit drug use costs the United States approximately $181 billion every year.

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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.

The main events of mitosis and meiosis The main events of mitosis and meiosis
Major Events in the History of Psychology (3 of 6) Major Events in the History of Psychology (3 of 6)
Major Events in the History of Psychology (5 of 6) Major Events in the History of Psychology (5 of 6)
The Events of the Germinal Period The Events of the Germinal Period
Homeless woman with her possessions on a park bench in Beverly Hills, California. The contrast ... Homeless woman with her possessions on a park bench in Beverly Hills, California. The contrast ...
A comparison of the events in mitosis (left) and meiosis (right) A comparison of the events in mitosis (left) and meiosis (right)
Video: Summation - defined, spatial, temporal & AP generation or not

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