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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.
The average adult has about 21 square feet of skin.
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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.