“For each individual mind there is an optimal level of stimulation. The more intelligent and the more developed the brain, the higher level of stimulation is absolutely necessary to make it feel right. An intelligent brain craves stimulation the way a gambler craves roulette. It seeks stimulation by picking up puzzles to solve, problems to uncover, ideas to examine, patterns to discern, contradictions to catch and resolve. What happens when the brain is understimulated with too little mental feed? The result is boredom, ennui, restlessness, irritability, and depression.” - Piechowski