http://www.newscientist.com/article/...l#.U1mEEFVdX87
Reveals clues as to why we age and why our tissues break down.
Truly Fascinating.
Quote:
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What they found suggests, as we could perhaps expect, that our lifespan might ultimately be limited by the capacity for stem cells to keep replenishing tissues day in day out. Once the stem cells reach a state of exhaustion that imposes a limit on their own lifespan, they themselves gradually die out and steadily diminish the body's capacity to keep regenerating vital tissues and cells, such as blood.
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