Young David felt stuck tending his family's sheep every day--yes, the sheep were important, but they were also boring, stubborn, and had no sense of humor. David wanted excitement. When excitement appeared in the form of a mountain lion that carried away one of the lambs, David vowed to never let that happen again, and set about learning to fight, using a slingshot. But a slingshot is no easy weapon, and it took David a long time to learn to...