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Put slightly differently, the behavior of the whole can’t be predicted by the behavior of the parts examined separately. Only by considering the relationships between parts can you explain a system’s behavior. There are man-made systems and nature-made systems. In every case, how elements interrelate is what matters most. Consider the striking difference between graphite, the soft gray substance in pencils, and a diamond, that sparkling gemstone so prevalent in engagement rings. Although we know them as profoundly different substances, both consist exclusively of carbon atoms.