He scored off the chart on every objective measurement tested. As Charlie Brown and the "Peanuts" gang told us, happiness could be a warm puppy, pizza with sausage, five different crayons - or anyone, or anything, that's loved by you. And, although it's true that many special moments are inspired by such happenstance, scientific research contends that people actually can condition themselves for genuine happiness, much as occasional joggers condition themselves for marathons. Truly happy people are able to, for example, recall special moments and use them as psychological tools to deal with...