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Cyanide works by making the human body unable to use oxygen.

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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The average office desk has 400 times more bacteria on it than a toilet.

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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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