Every day for the last four years, Leah Alcala has greeted her Berkeley, California, middle-school students with an exercise she calls "my favorite no," the Huffington Post reports. As students enter class, they see a math problem on the whiteboard and are instructed to solve it on index cards. After they finish, Alcala immediately sees which answers are right or wrong -- "yes" and "no" -- and chooses her favorite incorrect response, the one most liable to be repeated. She then explains the mistake to the class -- never identifying its culprit -- and demonstrates how it can...

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