For the last 20 years the first sunday in May has been dedicated to World Laughter Day. As KYW's Justin Udo reports, the purpose of the day is to change the world in a peaceful and positive way through laughing.

<p>For the last 20 years the first sunday in May has been dedicated to World Laughter Day. As KYW's Justin Udo reports, the purpose of the day is to change the world in a peaceful and positive way through laughing.</p>

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