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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.

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IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.

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A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.

A melanistic jaguar is a colour morph which occurs at about 6% frequency in populations. A melanistic jaguar is a colour morph which occurs at about 6% frequency in populations.
Vehicle transmission occurs through contamination of inanimate objects, such as milk. Vehicle transmission occurs through contamination of inanimate objects, such as milk.
Breast cancer. Notice the tumor growing within a lactiferous gland, which occurs in infiltrating duc Breast cancer. Notice the tumor growing within a lactiferous gland, which occurs in infiltrating duc
The transition between steps usually occurs at a temperature that would not interfere with cold ... The transition between steps usually occurs at a temperature that would not interfere with cold ...
How to factor a trinomial using trail-and-error How to factor a trinomial using trail-and-error
How wide must a narrow slit be if the first diffraction minimum occurs at 12 with laser light ... How wide must a narrow slit be if the first diffraction minimum occurs at 12 with laser light ...
Video: Bone tissue types - compact and spongy

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