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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).
There are 60,000 miles of blood vessels in every adult human.
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.