In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Thyroid conditions may make getting pregnant impossible.
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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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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
The effects of epinephrine in humans
The process of respiration.
Angioplasty. One form is called balloon angioplasty, shown here. A balloon catheter is threaded into
Nursing process
Spinous process
Opener Alignment comparing DNA sequence for the leptin gene from dogs (top) and humans (bottom)