Something that Robert Provine has pointed out, as you can see here, and the reason why we were laughing when we heard those funny laughs at the start, and why I was laughing when I found my parents laughing, is that it's an enormously behaviorally contagious effect.
Robert Provine सांगतो हसण्याचे कारण सुरवातीस मजेशीर प्रसंगाने आपण हसतो . माझे पालक हसत होते म्हणून मी हसत होत्ये . हसणे हे सांसर्गिक आहे .