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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.
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The average office desk has 400 times more bacteria on it than a toilet.
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There are more sensory neurons in the tongue than in any other part of the body.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.