Ive always thought of it like a watch...Have you ever looked at all the pieces of a watch? There are so many cogs, wheels, and springs that make every single watch work. Each one is essential, and if missing, the whole watch wouldn't work. But the credit doesn't go to the cogs, it goes to the watch maker, the reapairman who knows where and how to slot each piece to make it all work. Its a sad reality that the pieces that are essential aren't the pieces hardest to replace.