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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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Everyone has one nostril that is larger than the other.

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Asthma attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.

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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

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Drug abusers experience the following scenario: The pleasure given by their drug (or drugs) of choice is so strong that it is difficult to eradicate even after years of staying away from the substances involved. Certain triggers may cause a drug abuser to relapse. Research shows that long-term drug abuse results in significant changes in brain function that persist long after an individual stops using drugs. It is most important to realize that the same is true of not just illegal substances but alcohol and tobacco as well.

The breast, cutaway view showing both internal and external features. The breast, cutaway view showing both internal and external features.
Range of Motion of the Shoulder Joint, Internal Rotation Range of Motion of the Shoulder Joint, Internal Rotation
Cross page from the Lindisfarne Gospels. Cross page from the Lindisfarne Gospels.
The internal and external anatomy of the kidney. The internal and external anatomy of the kidney.
Internal and External Loci of Control Internal and External Loci of Control
Opener A colorized cross section of the human brain Opener A colorized cross section of the human brain
Video: T cell receptors

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