Today is the sixth anniversary of the most amazing and life-shaking day I’ve ever had: the day my quadruplets–Pat, Nick, Ken, and Helen Forbeck–were born. They finish kindergarten this week, and I couldn’t be prouder of them. They’re all great, wonderful kids with intriguing, inquisitive, and distinctive personalities. Watching them–and their older brother Marty–grow is the greatest joy my wife …