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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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Stevens-Johnson syndrome and Toxic Epidermal Necrolysis syndrome are life-threatening reactions that can result in death. Complications include permanent blindness, dry-eye syndrome, lung damage, photophobia, asthma, chronic obstructive pulmonary disease, permanent loss of nail beds, scarring of mucous membranes, arthritis, and chronic fatigue syndrome. Many patients' pores scar shut, causing them to retain heat.

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To combat osteoporosis, changes in lifestyle and diet are recommended. At-risk patients should include 1,200 to 1,500 mg of calcium daily either via dietary means or with supplements.

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There are 20 feet of blood vessels in each square inch of human skin.

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Fatal fungal infections may be able to resist newer antifungal drugs. Globally, fungal infections are often fatal due to the lack of access to multiple antifungals, which may be required to be utilized in combination. Single antifungals may not be enough to stop a fungal infection from causing the death of a patient.

Operant conditioning, also known as trial-and-error learning. Operant conditioning, also known as trial-and-error learning.
Einstein's letter Einstein's letter
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Wild chimpanzees make and use simple tools to obtain food, learning tool making from one another. Wild chimpanzees make and use simple tools to obtain food, learning tool making from one another.
An example of a cover letter sent in response to a classified ad. An example of a cover letter sent in response to a classified ad.
Learning plant parts kindergarten Learning plant parts kindergarten
Video: Simple and Double Sugar

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