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Approximately 500,000 babies are born each year in the United States to teenage mothers.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.
The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.