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FILE - In this Oct. 1, 2013, file photo, third grade teacher Melissa Grieshober teaches a math lesson at Silver Lake Elementary School in Middletown, Del. Sometime in elementary school, you quit counting your fingers and just know the answer. Now scientists have put youngsters into brain scanners to find out why, and watched how the brain reorganizes itself as kids learn math. (AP Photo/Steve Ruark, File)