The study of self-control is being increasingly studied by social psychologists, as they have found it to be as important to achievement as intelligence and grit.

FORBES: Lessons From Obama's Victory And Romney's Loss That You Can Apply To Your Cause

In the new study, scientists studied mitochondrial DNA extracted from well-dated fossil bear skeletons to work out how population size changed over time.

BBC: Early human 'squatters' drove cave bears to extinction

In last year's study, the average service time at the McDonald's drive-through studied was 188.83 seconds, compared with 129.75 for industry leader Wendy's Co.

WSJ: McDonald's Tackles Repair of 'Broken' Service

Nissen's study studied heart patients taking either Pravachol, from Bristol-Myers Squibb (nyse: BMY - news - people ), or high-dose Lipitor, from Pfizer (nyse: PFE - news - people ).

FORBES: Inflammation Is Key In Heart Attacks

In that study the medical work histories of more than 78, 000 nurses were studied over a 10-year period.

BBC: Breast cancer link to nightshifts

"In my study, the model minority pressure is a huge factor, " says Noh, who studied 41 Asian-American women who'd attempted or contemplated suicide.

CNN: Push to achieve tied to suicide in Asian-American women