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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
The human body produces and destroys 15 million blood cells every second.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.