So Robert Provine, who has done a lot of work on this, has pointed out that you are 30 times  more likely to laugh if you are with somebody else than if you're on your own, and where you find most laughter is in social interactions like conversation.
Robert Provine, care a studiat mult râsul, a arătat că e de 30 de ori mai probabil să râzi dacă ești cu cineva decât singur. Cel mai mult râdem când interacţionăm social, cum ar fi în conversaţie.