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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

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Oxytocin is recommended only for pregnancies that have a medical reason for inducing labor (such as eclampsia) and is not recommended for elective procedures or for making the birthing process more convenient.

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Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).

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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.

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Hypertension is a silent killer because it is deadly and has no significant early symptoms. The danger from hypertension is the extra load on the heart, which can lead to hypertensive heart disease and kidney damage. This occurs without any major symptoms until the high blood pressure becomes extreme. Regular blood pressure checks are an important method of catching hypertension before it can kill you.

The thorax of apes, including humans, is broad but shallow in contrast to the narrower, deeper chest The thorax of apes, including humans, is broad but shallow in contrast to the narrower, deeper chest
Enhancement of Contrast Enhancement of Contrast
Chemical similarities between para-aminobenzoic acid and sulfonamides. Chemical similarities between para-aminobenzoic acid and sulfonamides.
Structural similarities between antimetabolites and their natural counterparts. Structural similarities between antimetabolites and their natural counterparts.
The early development of the mammalian brain illustrated in schematic horizontal sections. Compare ... The early development of the mammalian brain illustrated in schematic horizontal sections. Compare ...
Ferrante, Chapter 11, Economics & Politics Ferrante, Chapter 11, Economics & Politics
Video: Chemical Changes

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