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Did you know?

According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.

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The oldest recorded age was 122. Madame Jeanne Calment was born in France in 1875 and died in 1997. She was a vegetarian and loved olive oil, port wine, and chocolate.

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When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).

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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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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

Lateral Cross Section of the Interior Eye Lateral Cross Section of the Interior Eye
(A) Lumbar puncture, also known as spinal tap; (B) section of the vertebral column showing the spina (A) Lumbar puncture, also known as spinal tap; (B) section of the vertebral column showing the spina
The respiratory system. (a) Sagittal section of the head and neck, revealing the organs of the upper The respiratory system. (a) Sagittal section of the head and neck, revealing the organs of the upper
Intramuscular drug administration: (a) cross section of skin showing depth of needle insertion Intramuscular drug administration: (a) cross section of skin showing depth of needle insertion
Cross Section of the Human Brain Cross Section of the Human Brain
Transverse section of midbrain Transverse section of midbrain
Video: Central Nervous System Animation

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