Gregory So Kam-leung (C), secretary for Commerce and Economic Development of Hong Kong completes the “Ice Bucket Challenge” by pouring a bucket of ice cubes over his head in Tamar Park of Hong Kong on August 20, 2014. The Ice Bucket Challenge, sometimes called the ALS Ice Bucket Challenge, is a charity activity involving dumping a bucket of ice water on one's head or donating to the ALS Association in the United States. Amyotrophic lateral sclerosis (ALS,) a neurodegenerative disorder, is commonly called Lou Gehrig's disease, after the baseball player who had it. [Photo: China News Service/ Tan Daming]