For the International Day of Happiness, scientists share mindfulness practices that help them feel more connected, grateful, and satisfied. "I literally learned on the go: While biking to work, I started playing with offering kindness to drivers that honked at me, and found that when I got to the hospital I was peaceful and happy instead of angry at 'those drivers.' Life-changing practice," says Judson Brewer, associate professor at the University of Massachusetts Medical School.