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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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Cyanide works by making the human body unable to use oxygen.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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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.
![(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)
![Two stubby screwdrivers used to access screws that have limited space above. A straight blade is on ...](https://biology-forums.com/gallery/29/medium_548020_25_05_17_2_36_14_294321111.png)