Stop by the baseball field some afternoon, and you’re likely to hear me say, “Use two hands!” Since time immemorial, baseball coaches have implored their players to use two hands when catching fly balls. If you played baseball (or softball) when you were younger, you probably heard it as well. You may have even said it to your children when first teaching them how to play catch. More recently, though, I’ve begun to recognize the relevance of this phrase to my work as a history teacher. Allow me to explain.