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Your heart beats over 36 million times a year.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.