People line up outside a walk-in COVID-19 vaccination site in Tokyo's Shibuya area on Aug. 28, 2021, to get lottery tickets for about 300 doses to be administered that day to those aged between 16 and 39 who reside in or commute to the Japanese capital. Almost overnight, Japan has become a stunning, and somewhat mysterious, coronavirus success story. Case numbers are way down, but experts worry that without knowing how exactly it cut cases so drastically, the nation may be in store for another devastating wave like during the summer. (Kyodo News via AP)