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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
The human body produces and destroys 15 million blood cells every second.
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
The familiar sounds of your heart are made by the heart's valves as they open and close.
Drug abusers experience the following scenario: The pleasure given by their drug (or drugs) of choice is so strong that it is difficult to eradicate even after years of staying away from the substances involved. Certain triggers may cause a drug abuser to relapse. Research shows that long-term drug abuse results in significant changes in brain function that persist long after an individual stops using drugs. It is most important to realize that the same is true of not just illegal substances but alcohol and tobacco as well.