"She responded very well to that, " he said, smiling and even tearing up a bit.

CNN: STORY HIGHLIGHTS

The secrecy was serious: when he spoke of spirits, his smiling face became deadly sober and even scared.

ECONOMIST: Mau Piailug

"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.

WSJ: Stress-Busting Smiles

The beloved Rose, he reports, took great pleasure in inflicting pain on these victims. (The film ends with a display of pictures of the women, shown young and smiling, who were murdered by West and his wife.) Even as he reveals more and more horrors under Janet's prodding, her feeling of connection to this killer grows stronger.

WSJ: Appropriate Adult | The Last Lions | To Serve a Serial Killer | Television Reviews by Dorothy Rabinowitz

Yet, even in a wheelchair, Sara would always arrive smiling, makeup on and bangs bobby-pinned out of her eyes.

NEWYORKER: Letting Go

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.

FORBES: Where Do Bankers Smile? On The Davos Party Circuit

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.

FORBES: New Data on 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.

FORBES: Carla Bruni-Sarkozy On Art, Philanthropy