Is There a Formula for Smart Thinking?

One day, one of my kids was star­ing at a sim­ple cir­cuit dia­gram. It showed a bat­tery con­nect­ed to a resis­tor and a light bulb. He was doing a home­work prob­lem. The par­tic­u­lar ques­tion that had him stumped asked what would hap­pen to the cur­rent in the cir­cuit if the resis­tor was replaced with another…

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