why we laugh
TRANSCRIPT
WHY WE LAUGH
MAMMELS LAUGH
UNDERSTAND WITH AGE
INVOLUNTARY
VOLUNTARY LAUGH
CONTAGIOUS
INTE
RACT
IONS
LOWER STRESS
TRANSCRIPT
WHY WE LAUGH
MAMMELS LAUGH
UNDERSTAND WITH AGE
INVOLUNTARY
VOLUNTARY LAUGH
CONTAGIOUS
INTE
RACT
IONS
LOWER STRESS