Scientifically speaking, what is the purpose of laughter? Why is it so important for our brains and well-being? And how might it help us get back to “normal” as we emerge from the pandemic? CNN Chief Medical Correspondent Dr. Sanjay Gupta speaks with Emmy- and Grammy-nominated comedian Tig Notaro about telling cancer jokes after her 2012 breast cancer diagnosis and why she actually laughed a lot during quarantine. We also hear from humor expert and psychologist Janet Gibson, as well as medical clown "Chester Drawers" played by Leo Desilets.

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