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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.
There are 60,000 miles of blood vessels in every adult human.
After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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.
An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.