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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.
The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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.
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.
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.