SAN FRANCISCO (KGO) -- It's 10:30 in the morning and Calvin Kai Ku is making the rounds in the Pediatric Unit at California Pacific Medical Center.
He's not a doctor or a nurse. He's a medical clown.
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And what he does to improve the health of patients is indispensable.
Watch the video above to learn more about the healing power of laughter.
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Learn more about the Medical Clown Project.