A sense of humor can brighten family life. You can blow raspberries on a baby's belly, put on a silly hat and chase a 3-year-old, or pretend to fall into a pile of leaves to amuse a first-grader. As kids grow into preteens and teens, you can share puns and jokes as their sense of what's funny grows more sophisticated. Laughing together is a way to connect, and a good sense of humor also can make kids smarter, healthier, and better able to cope with challenges. We tend to think of humor as part of our genetic makeup, like blue eyes or big feet. But a sense of humor actually is a learned quality that can be developed in kids, not something they're born with. What's So Funny Anyway? Humor is what makes something funny; a sense of humor is the ability to recognize it. Someone...