1．
Accordingto a study at the University of Marland Medical Center in Baltimore，researchers found that people who had a good sense of humor and laughed a lot，not only at home but also at work，had fewer heart problems than people who laughed less，and laughing people tend to live a longer life than the ones who are not．
After reading plenty of information about the benefits of laughing and a careful study of previous papers in this area，a doctor in India started a laughter club．Dr．Mandan Damaris's laughter club quickly grew into 1，800groups throughout India and over 6，000around the world．The laughter club had even inspired World Laughter Day，which people celebrate on the first Sunday of May every year．Instructors at the clubs get people laughing not only through jokes but through simple laughing exercises，For example，instructors and participants repeat the chant"ho-ho-ho"and"ha-ha-ha"together．What's more，participants also do the"Lion laugh"by sticking out their tongues and waving their hands around their ears．Other exercises focus on breathing and simple yoga exercises．In a word，all the activities that can cause laugh are included in the clubs．
These laughter clubs are very popular in hospitals and nursing homes nowadays in India，where participants can forget about their aches and pains while laughing．It seems that laughing may be just as important as eating right and exercising．
Not everyone can join a laughter club，but we all can take part in the same practice．According to the doctor，besides taking part in the clubs，everyone can do something to make themselves laugh．How can you make laughing a part of your daily routine？If you feel funny about joining a laughter club，you can rent a funny movie，remember a funny experience，do some sports，go to the zoo，watch the monkeys or even，just make yourself laugh．You will not be able to keep a straight face all the time．
So，don't worry；be happy．Laugh a little and live longer．
______ ．