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Every man can, if he so desires, become the sculptor his own brain“.
             Santiago Ramon y Cajal (1852-1934)
                             Spanish Neuroscientist

  Life is distinguished from the inanimate by its ability to recreate itself and hold a pattern.  Throughout our lives, The very material we are made up of is recycled or regenerated.  Every few weeks we completely change out the cells that compose our skin.   The body is constantly in a state of regenerating itself.  Even the bones are borrowing or depositing calcium throughout our lives.  The machinery of our cells are constantly disposing of waste, replacing damaged portions, killing cells that are old or dysfunctional and making new ones.  All this processes are kept in order by our genetic information.  In essence the only thing that holds our form and keeps it from weathering away and degenerating is our DNA.  This is the master set of instructions that our cells use to replace, rebuild, and develop us into the body we now have.  It is the ultimate difference between the collection of elements that is us, and a rock.

     However, there is much more to what we are than just the DNA blueprints.  I remember a moment at the beginning of my very first year of medical school that really brought this home to me.  In anatomy we had to memorize every crater, every bump, every nodule, line and crevice in every bone in the body.  As we learned about these landmarks, we learned that they form not as part of some genetic program, but as a reaction to stress forces from pulling tendons and ligaments, triggering a reaction that caused the cells in that part of the bone to duplicate and reinforce the bone as needed.  In other words, our actions determine the shape of our bones every bit as much as our genes.

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