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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.
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Women are 50% to 75% more likely than men to experience an adverse drug reaction.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.