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The average adult has about 21 square feet of skin.
Asthma attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.
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).
Excessive alcohol use costs the country approximately $235 billion every year.
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.
![Stacking the joints. A. Correct thumb–wrist alignment for applying direct pressure. B. Incorrect ...](https://biology-forums.com/gallery/32/medium_380798_22_08_17_9_33_15_329441530.jpeg)
![Dorsiflex the foot, applying direct pressure to the bottom. Standing at the end of the table, pick ...](https://biology-forums.com/gallery/33/medium_380798_23_08_17_7_05_50_33320678.jpeg)