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Did you know?

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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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.

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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.

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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

The internal structures of the outer, middle, and inner ear. The internal structures of the outer, middle, and inner ear.
An adult tooth, longitudinal view showing internal structures of the crown and root. An adult tooth, longitudinal view showing internal structures of the crown and root.
The internal anatomy of the kidney. The internal anatomy of the kidney.
Effleurage to pectoral muscles using fist. Lift the arm, holding just below the wrist. Apply ... Effleurage to pectoral muscles using fist. Lift the arm, holding just below the wrist. Apply ...
Apply oil or lotion to the entire arm from distal to proximal, including around the shoulder. Apply oil or lotion to the entire arm from distal to proximal, including around the shoulder.
Apply thumb pressure to forearm muscles, particularly the extensors muscles. Apply circular friction ... Apply thumb pressure to forearm muscles, particularly the extensors muscles. Apply circular friction ...
Video: Types of Shock (Part 2 of 2)

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