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Did you know?

On average, the stomach produces 2 L of hydrochloric acid per day.

Did you know?

On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.

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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

Attack systems of pathogenic bacteria. Attack systems of pathogenic bacteria.
Tropical rain forest in Borneo. Within the three-dimensional framework of tropical rain forests live Tropical rain forest in Borneo. Within the three-dimensional framework of tropical rain forests live
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Archaea, Eukarya, Bacteria Differences Chart Archaea, Eukarya, Bacteria Differences Chart
Many older adults live active lives well into their eighties and beyond. Many older adults live active lives well into their eighties and beyond.
Example of gene control in bacteria Example of gene control in bacteria
Video: Audiology

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