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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.
Vaccines prevent between 2.5 and 4 million deaths every year.
Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
The horizontal fraction bar was introduced by the Arabs.
There are 20 feet of blood vessels in each square inch of human skin.
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