11 Brain-Freezing Facts for Slurpee’s 50th Birthday

(via mental_floss) With more than 13 million cups consumed every month, 7-Eleven’s Slurpee might be the most popular frozen beverage in the world. In honor of the brain-freezing drink’s 50^th birthday this year, 7-Eleven will be dispensing free small Slurpees in their 10,400 North American locations on Monday, July 11; meanwhile, mental_floss is  dispensing some facts on its history, Slurpee milestones, and why you can’t fill a kiddie pool with the slush.