Assertion: laughter | /r/HasProperty | unique emotional expression
Facets:
Source sentences:
text: For many years psychologists and behavioral biologists agreed that laughter was a unique emotional expression found only in humans.
text: For many years psychologists and behavioral biologists agreed that laughter was a unique emotional expression found only in humans.
text: For many years psychologists and behavioral biologists agreed that laughter was a unique emotional expression found only in humans.
text: For many years psychologists and behavioral biologists agreed that laughter was a unique emotional expression found only in humans.