In this June 26, 2013 photo, people cool off on a hot summer day in Esplanade Park in Helsinki, Finland. In summer, glorious sun-filled days draw picnickers to every available last patch of grass. (AP Photo/Lehtikuva, Martti Kainulainen) FINLAND OUT

Associated Press
In this June 26, 2013 photo, people cool off on a hot summer day in Esplanade Park in Helsinki, Finland. In summer, glorious sun-filled days draw picnickers to every available last patch of grass. (AP Photo/Lehtikuva, Martti Kainulainen) FINLAND OUT
In this June 26, 2013 photo, people cool off on a hot summer day in Esplanade Park in Helsinki, Finland. In summer, glorious sun-filled days draw picnickers to every available last patch of grass. (AP Photo/Lehtikuva, Martti Kainulainen) FINLAND OUT
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