How can we get people to do more good, to go to the polls, give to charity, conserve resources, or even to do something as simple as washing their mugs at work so that the sink isn't always full of dirty dishes?
Bagaimana kita mengajak orang untuk berbuat lebih baik, ikut pemilihan, beramal, hemat sumber daya, atau sesederhana mencuci cangkirnya di kantor agar wastafel tidak penuh dengan piring kotor?