Push the button in the elevator for a fellow rider. Help an elderly person up the steps of a building or a subway exit or onto a bus. Put your pocket change into a charity box. Invite a fellow shopper to move ahead of you in the check-out line. Shovel the snow off your neighbor’s walk. Offer to let someone share your umbrella. Random acts of kindness require very little effort, but such acts pay great dividends in the good karma and personal happiness they generate.