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Did you know?

Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

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Never take aspirin without food because it is likely to irritate your stomach. Never give aspirin to children under age 12. Overdoses of aspirin have the potential to cause deafness.

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

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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.

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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.

Color-enhanced scanning electron micrograph of HIV virus (red) infecting T-helper cells (green). Color-enhanced scanning electron micrograph of HIV virus (red) infecting T-helper cells (green).
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Samples from the range of continuous variation in human eye color. Different alleles of more than on Samples from the range of continuous variation in human eye color. Different alleles of more than on
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Video: Electrical changes in the heart

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