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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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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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There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

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Disorders that may affect pharmacodynamics include genetic mutations, malnutrition, thyrotoxicosis, myasthenia gravis, Parkinson's disease, and certain forms of insulin-resistant diabetes mellitus.

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The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.

Pilates Exercises Strengthen the Body’s Core Muscles. Pilates Exercises Strengthen the Body’s Core Muscles.
Thumb press Inner and Outer Bladder meridians in upper back between shoulder blades; press into ... Thumb press Inner and Outer Bladder meridians in upper back between shoulder blades; press into ...
The Upper (A) and Lower (B) Respiratory Tracts (1 of 2) The Upper (A) and Lower (B) Respiratory Tracts (1 of 2)
Differences in brain metabolism in the brain of an unaffected individual (upper) and a schizophrenic Differences in brain metabolism in the brain of an unaffected individual (upper) and a schizophrenic
Staphylococcus epidermidis, a common colonizer of human skin. Staphylococcus epidermidis, a common colonizer of human skin.
The forces of diffusion and electrostatic pressure. (a) In diffusion, solutes move from an area of h The forces of diffusion and electrostatic pressure. (a) In diffusion, solutes move from an area of h
Video: Phases of mitosis

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