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Did you know?
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.