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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.

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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

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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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There are more nerve cells in one human brain than there are stars in the Milky Way.

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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.

The stability of carbon bonds makes life possible even in extreme environments The stability of carbon bonds makes life possible even in extreme environments
Brain cells of a laboratory mouse are shown glowing with multicolor fluorescent proteins Brain cells of a laboratory mouse are shown glowing with multicolor fluorescent proteins
The 20 common amino acids of proteins The 20 common amino acids of proteins
Peptide bond as resonance hybrid of two forms Peptide bond as resonance hybrid of two forms
Catalysis of peptide bond hydrolysis by chymotrypsin (part 1) Catalysis of peptide bond hydrolysis by chymotrypsin (part 1)
Fluorescent antibodies against proteins in the dosage compensation complex Fluorescent antibodies against proteins in the dosage compensation complex
Video: Requirements for nervous signals

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