Develop some new mental models. Each of the big academic disciplines were created to explain certain phenomena or answer certain questions. So, develop other "lenses" or mental models in which to see the world.
Pick up a few "for dummies" or "complete idiot's guide to" books on subjects like psychology, economics, demographics, nutrition, excersize, physics, chemistry, biology, evolutionary biology, mathematics, whatever. Especially look for subjects you might have avoided when younger.
One benefit I've had from learning about evolutionary biology (Mean Genes is a wonderful book) is to learn more about myself and what really makes people and myself tick.
The other benefit of this is that you actually learn to see the world in a larger and more colourful way. And, having multiple mental models allows you to solve a greater variety of problems in a greater variety of ways. So it's not just mental excersize, but also very practical. The benefits just go on and on.
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