For however elusive happiness is to define, there are very specific things people can do each day that are proven to increase happiness: Tal Ben-Shahar has spent his career studying them. He gave Big Think several practical happiness tips, including changing your calendar, buying a notebook, and changing your approach to car parking.

Tal Ben-Shahar is an author and lecturer at Harvard University. He currently teaches the largest course at Harvard on “Positive Psychology” and the third largest on “The Psychology of Leadership”–with a total of over 1,400 students.