1.   But, in a departure from decades of research on depression, psychologists are now actively studying what makes us happy.

2.   In this one, you can join Kennedy in studying what makes people tick, why they do the quirky things they do.

3.   Nielsen has made a career out of studying what makes a Web site work and what makes a site fail.

4.   Subaru has since studied what made it successful in the first place.

5.   We have to keep studying what makes truly lasting music.