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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

