We're happier when busy but our instinct is for idleness

"Forced to wait for fifteen minutes at the airport luggage carousel leaves many of us miserable and irritated. Yet if we'd spent the same waiting time walking to the carousel we'd be far happier. That's according to Christopher Hsee and colleagues, who say we're happier when busy but that unfortunately our instinct is for idleness. Unless we have a reason for being active we choose to do nothing – an evolutionary vestige that ensures we conserve energy.

Consider Hsee's first study. His team...