Money CAN buy happiness, but there’s a catch: You have to keep appreciating things your money buys you, say Texas Tech University researchers. “Just having a nice car or beautiful handbag won’t make you happy in the long run,” says Jeff Larsen, Ph.D., assistant professor of psychology, “unless you continue to value it even after you’ve had it for a while.” How to maintain fresh gratitude for your not so fresh belongings? At least once a week take a moment to reflect on why you fell in love with your possession in the first place. It might work when you’re mad at your spouse, too.