Thyroid conditions may make getting pregnant impossible.
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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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There are more bacteria in your mouth than there are people in the world.
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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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Everyone has one nostril that is larger than the other.
The basic structure of a spermatozoon (SPERM).
How to plot a sine function containing an amplitude and phase-shift (Question 2 of 3)
Barenaked Ladies - Call And Answer (Video Version)