The data is overwhelming: adults who commit themselves to acts of service and make volunteering a part of their life are just way happier. And, like everything else, that's a muscle you start building when you're a kid. But unless you belong to a religious community, you've kind of got to bring your own beer in terms of incorporating service into your family's life. And with young kids, your options can feel a little limited, because... well, no offense, but five year olds suck at a lot of st...