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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.
More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.