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The average adult has about 21 square feet of skin.
Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
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.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
![(a) In a healthy eye, aqueous humor is formed in the ciliary process and drains through the canal of ...](https://biology-forums.com/gallery/28/medium_482573_29_04_17_8_18_08_288612197.jpeg)
![Sixteen-pin OBD II DLC with terminals identified. Scan tools use the power pin (16) ground pin (4) ...](https://biology-forums.com/gallery/29/medium_548020_30_05_17_8_06_00_298932327.png)