Have Blood, Will Travel

This is a new fact to me, from NASA's science site: every few seconds or so, more than 10 million red blood cells in your body die. They're being replenished on a regular basis by stem cells in your bone marrow. NASA is wondering just what long term exposure to cosmic rays will do to those cells. This is especially important if humans intend to do any long term work in space -- like traveling to Mars for instance.

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