|
|
Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
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.
The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.
Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
![The cypress hills in Alberta and Saskatchewan were the northern-most location that remained south of](https://biology-forums.com/gallery/47/medium_33_19_02_12_5_39_51_2061175.jpeg)
![In 2013, Americans learned that the federal government massively surveys their phone calls and e-mai](https://biology-forums.com/gallery/47/medium_262797_12_08_15_1_46_35_221931656.png)