When I was a teenager, we loved to play baseball, and in my neighborhood there were two teams. Both of them were quite good, but they were bitter rivals. It was not uncommon for fights to break out when they played each other. On one very memorable day, a very boastful team from another neighborhood challenged our neighborhood to a game. Their team was quite formidable by reputation, and neither of our teams would likely have been able to beat them. We decided to put aside our differences and use our strongest players to form one neighborhood team to take...