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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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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.
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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 bacteria in your mouth than there are people in the world.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.