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There are more bacteria in your mouth than there are people in the world.
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.
If you use artificial sweeteners, such as cyclamates, your eyes may be more sensitive to light. Other factors that will make your eyes more sensitive to light include use of antibiotics, oral contraceptives, hypertension medications, diuretics, and antidiabetic medications.
According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.