Smiling can make you happier—unless someone forces you to do it
Nicholas Coles, Ph.D., had long heard that forcing a smile can make you feel a little happier—after all, he had done a lot of the research that supposedly proved it. But something didn't sit quite right with his own findings.
原文出处：Phys.org （本文由聚合程序自动采集，版权归原作者所有）