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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
The term pharmacology is derived from the Greek words pharmakon("claim, medicine, poison, or remedy") and logos ("study").
There are more nerve cells in one human brain than there are stars in the Milky Way.
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.
![A study by Seehausen and van Alphen involving the effects of male coloration on female choice in Afr](https://biology-forums.com/gallery/47/medium_33_12_07_11_4_13_46.jpeg)
![Sociologists study the social factors that underlie human behavior, the experiences that mold us, ...](https://biology-forums.com/gallery/27/medium_660366_14_04_17_2_38_13_278121988.png)