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http://www.psychologytoday.com/rss/pto-20051229-000002.html

>>To Rashid's surprise, he found participants who bowled with strangers were happier than students who hand-picked buddies to accompany them (and, as expected, people who bowled by themselves). For those who made new friends, the experience was similar to a successful date. Says Rashid, "They were euphoric." Although college students tend to be an outgoing bunch, Rashid says one's level of extroversion didn't predict who would see the greatest uptick in mood.<<