The Tension relationship is an arena of creative friction. There are clear differences between the two people, and those differences sometimes strike sparks. Yet it is this very friction that generates new ideas, new perspectives, new possibilities. Just as a voltage difference in physics produces an electric current, psychological differences produce a flow of creative energy. Dialogue in this relationship is always stimulating. Predictability is low, and there is a sensation of being pushed out of your comfort zone. In neuroscience terms, this activates the dopamine system. Novelty response, prediction-error correction, resolution of cognitive dissonance -- all of these energize the brain and promote growth. A Tension relationship may not be comfortable, but it unquestionably keeps the brain young.