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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.
Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.
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.
![Skin structure, including the three layers of the skin and the accessory organs: sweat gland, sebace](https://biology-forums.com/gallery/47/medium_14755_16_09_12_5_57_13_87522080.jpeg)
![As their numbers grow and their resources and health improve, the elderly will enjoy life more and ...](https://biology-forums.com/gallery/27/medium_660366_16_04_17_12_25_19_27861512.png)