Nature has been the master of this game for billions of years. Every living cell of even the simplest plant or animal is chock full of nanomachines quietly going about the business of life, every atom of these machines doing its part in concert with thousands of others, all in perfect molecular harmony. But biology needs water, and living cells are soft. Neither flesh nor bone is as strong as steel. Nerves conduct electrical signals, but with no where near the speed and efficiency of good metals like copper or semiconductors like silicon.
Biology is incredibly powerful, but it can t do everything.
What s left is our responsibility. With NASA we now dedicate ourselves to bring this future promise to reality.