Even bankers were smiling, including chief marketing officer Arun Sinha of Zurich and chairman and CEO Jamie Dimon (above right, with Steve Forbes) of JP Morgan Chase.
"She responded very well to that, " he said, smiling and even tearing up a bit.
"We saw a steeper decline in heart rate and a faster physiological stress recovery when they were smiling, " even though the participants weren't aware they were making facial expressions, says Sarah Pressman, co-author of the study and an assistant psychology professor at University of California, Irvine.
The secrecy was serious: when he spoke of spirits, his smiling face became deadly sober and even scared.
Yet, even in a wheelchair, Sara would always arrive smiling, makeup on and bangs bobby-pinned out of her eyes.
Harry Wills, for the Lib Dems, arrived at 2340 GMT smiling with his wife, but an even cheerier Maurice Golden, the Conservative candidate, emerged just after midnight, his expression perhaps an indication of how that fight was about to turn out.
Even without this study, common sense tells us that smiling at others invites them in.
Moreover, even while professing impatience with the Poles, the French may be smiling behind their hands.
The Osmond family was the Mormon family: too many kids and too many teeth, maybe, but always solid, always smiling, always temperate no alcohol, no tobacco, not even caffeine.
Nevertheless, as I walk through the corridors of business organizations, enter meetings that are about to begin, embark on various modes of transportation and even engage with the host or hostess in a restaurant, I rarely see people smiling.
She even stopped the tour at one point to back track down a hallway and sneak into a jazz rehearsal, smiling broadly before slipping inside the room for a few moments to listen.
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