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Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
Famous people who died from poisoning or drug overdose include, Adolf Hitler, Socrates, Juan Ponce de Leon, Marilyn Monroe, Judy Garland, and John Belushi.
The longest a person has survived after a heart transplant is 24 years.