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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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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.

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Never take aspirin without food because it is likely to irritate your stomach. Never give aspirin to children under age 12. Overdoses of aspirin have the potential to cause deafness.

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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

Common spotted cuscus Common spotted cuscus
(a) Chimpanzees and (b) bonobos likely diverged from a common ancestor due to allopatric speciation (a) Chimpanzees and (b) bonobos likely diverged from a common ancestor due to allopatric speciation
A water spray bottle is an excellent diagnostic tool to help find an intermittent engine misfire ... A water spray bottle is an excellent diagnostic tool to help find an intermittent engine misfire ...
Prescriptions for common analgesics used in dentistry. Prescriptions for common analgesics used in dentistry.
Two common types of seed germination Two common types of seed germination
Common Root Words and Combining Forms Cont. Common Root Words and Combining Forms Cont.
Video: Muscular Dystrophy

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