It sounds strange to say that being a better artist might make me a stronger chess player or that listening to classical music can make you a more effective manager. And yet this is exactly the sort of thing that Feynman had in mind when he said that being a drummer made him a better physicist. When we regularly challenge ourselves with something new we build cognitive and emotional ‘muscles’ that make us more effective in every way. If we can overcome our fear of speaking in public, or of submitting a poem to a magazine, or of learning a new language, that confidence will flow into every area
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