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When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).
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.
Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.
Excessive alcohol use costs the country approximately $235 billion every year.
![Landbridge connections between continental Asia and Indonesia during glacial periods extend as far a](https://biology-forums.com/gallery/47/medium_275510_22_02_15_5_56_55_20768103.jpeg)
![William Masters and Virginia Johnson are among the most influential researchers in the history of th](https://biology-forums.com/gallery/47/medium_558257_07_07_16_12_34_14_236661532.jpeg)