Anahad O’Connor, for the NY Times:
After following the [bus] drivers closely, the researchers found that on days when the smiles were forced, the subjects’ moods deteriorated and they tended to withdraw from work. Trying to suppress negative thoughts, it turns out, may have made those thoughts even more persistent.
But on days when the subjects tried to display smiles through deeper efforts — by actually cultivating pleasant thoughts and memories — their overall moods improved and their productivity increased.
Fascinating.