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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Asthma-like symptoms were first recorded about 3,500 years ago in Egypt. The first manuscript specifically written about asthma was in the year 1190, describing a condition characterized by sudden breathlessness. The treatments listed in this manuscript include chicken soup, herbs, and sexual abstinence.
Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
The average adult has about 21 square feet of skin.
More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.
![Examples of common forms of strabismus: (A) esotropia with the right eye turning inward and (B) exot](https://biology-forums.com/gallery/47/medium_14755_27_08_12_12_24_58_81951044.jpeg)
![The early development of the mammalian brain illustrated in schematic horizontal sections. Compare ...](https://biology-forums.com/gallery/30/medium_548020_02_06_17_12_10_55_302161893.jpeg)