Assertion: laughter | /r/HasProperty | favored by evolution
Facets:
Source sentences:
text: Dr. Dunbar thinks laughter may have been favored by evolution because it helped bring human groups together, the way other activities like dancing and singing do.
text: In a previous interview, Dunbar stated that laughter may have been favored by evolution because it helped bring human groups together and that it is a bonding mechanism that even primates use.