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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

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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.

Some mangrove islands in the Florida Keys, which number in the thousands, are convenient places to t Some mangrove islands in the Florida Keys, which number in the thousands, are convenient places to t
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Richard Wrangham’s “female-bonded” theory of intergroup competition was highly influential in our un Richard Wrangham’s “female-bonded” theory of intergroup competition was highly influential in our un
How much the temperature will rise depends on many factors that affect the level of GHG emission How much the temperature will rise depends on many factors that affect the level of GHG emission
The assembly of general transcription factors required for the initiation of transcription by RNAP I The assembly of general transcription factors required for the initiation of transcription by RNAP I
Video: Primary and secondary response to infection

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