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Did you know?
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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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.
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There are more sensory neurons in the tongue than in any other part of the body.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.