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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.

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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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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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Approximately 500,000 babies are born each year in the United States to teenage mothers.

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