"In this Sept. 5, 2014 file photo, Principal Randy Thompson of Idlewild Elementary School pours a bucket of ice water over Shelby County Schools Superintendent Dorsey Hopson as part of the ""ALS Ice Bucket Challenge"" in Memphis, Tenn. The Ice Bucket Challenge placed fifth on Facebook's list of most popular topics worldwide in 2014, based on the number of posts, comments, likes, photos and videos shared. (AP Photo/The Commercial Appeal, Brad Vest, File)"
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