James Danckert, an associate professor of psychology at the University of Waterloo, in Canada, recently conducted a study to compare the physiological effects of boredom and sadness.

WSJ: Interesting Fact: There's a Yawning Need for Boring Professors

The study was conducted by David Kille, Amanda Forest and Joanne Wood at the University of Waterloo, in Canada, and will be published soon in Psychological Science.

ECONOMIST: Psychology: Tall, dark and stable | The

Prof David Hammond from the University of Waterloo in Ontario, said the ban led to a decline in smoking - especially among the young - in Canada.

BBC: Tobacco display ban 'to curb young smokers'