The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.
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Thyroid conditions may make getting pregnant impossible.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
Enhancement of Contrast
A Sense of Ethnicity
The Funneling Efffects of Education: Race-Ethnicity
Contrast of ventilation and external and internal respiration.
How lateral inhibition produces contrast enhancement. (Based on Ratliff, 1972.)