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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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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

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In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.

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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.

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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

Detritivores are often classified according to their body size as microflora, microfauna, mesofauna, Detritivores are often classified according to their body size as microflora, microfauna, mesofauna,
Planes of the body. Planes of the body.
Flynn Effect IQ scores have risen across developed countries in recent decades. Source: Flynn (199 Flynn Effect IQ scores have risen across developed countries in recent decades. Source: Flynn (199
A depiction of slaves on a South Carolina plantation, around 1790. Likely of Yoruba descent, they pl A depiction of slaves on a South Carolina plantation, around 1790. Likely of Yoruba descent, they pl
Body Part, Method of Examination, and Equipment Used During the General Physical Examination Cont. Body Part, Method of Examination, and Equipment Used During the General Physical Examination Cont.
Common substances for scrubs and/or body polishes. Common substances for scrubs and/or body polishes.
Video: Carbon fixing adaptations Animation

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