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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).