World Laughter Day
World Laughter Day is held on May 5. Was created in 1998 by Dr. Madan Kataria, founder of th worldwide Laughter Yoga movemen. This event in the first decade of the month May is annual. 
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The first World Laughter Day outside India was celebrated in Denmark in 2000 when more than 10 000 people gathered together at the Town Hall Square in Copenhagen.
It has been scientifically proven that laughter can be contagious and only about 10 per cent were generated by a joke. Everyone enjoys a good laugh, it’s a great way to make you feel good and be happy.
A healthy laughter can help you to reduce pain and prevent infections. One of the best ways to stay healthy is to start a day with a smile. A heavy laughter brings in much more oxygen to the lungs than normal breathing would do.
Some scientists believe that laughter was used as a way for humans to relate to one another millions of years before they developed the lung strength for language.
Nowadays, World Laughter Day is celebrated in many countries, including USA, United Kingdom, Germany, France, Denmark, Sweden, Hungary, Australia, and India.
Similar holidays and events, festivals and interesting facts
World Give Day on May 4 (is one day a year when people all over the world come together to support the causes they care about most. Whether you donate to your favorite non-profit, a person in your community, or give some of your time, World Give Day is a day to focus on giving back);
World Naked Gardening Day on May 4 (celebrated on the first Saturday of May);
Free Comic Book Day on May 4 (Held on the first Saturday in May);
Join Hands Day on May 4
Petite And Proud Day on May 4
Renewal Day on May 4
Star Wars Day on May 4 (International observance);
World Hand Hygiene Day on May 5
World Pulmonary Hypertension Day on May 5
International Handwashing Day on May 5 (since 2009, when the WHO Patient Safety Program launched a new initiative called Save Lives: Wash Hands);
African World Heritage Day on May 5
Cartoonists Day on May 5 (They were the favorite part of the morning paper for many of us growing up);
Cinco de Meow Day on May 5
5.25" Floppy Day on May 5 (#525FloppyDay);
No Homework Day on May 6 (this is the day where children can tell their teachers and parents in complete honesty that they will not be doing their homework, in order to mark this special day);
Coloring Day on May 6