People participate in "Walk to End Alzheimer's" in San Francisco

The organizer of the event Randal Yip tells the story of his mother's experience with Alzheimer's disease at AT&T Park in San Francisco, the United States, Nov. 10, 2018. "Walk to End Alzheimer's" is an event to raise awareness and funds for Alzheimer's care, support and research, which calls on participants of all ages and abilities to join the fight against the disease. (Xinhua/Shawn Huang)