Anatoly Maltsev / EPA
Russian students launch paper lanterns during a flashmob action marking 'Day of Knowledge' in St. Petersburg, Russia, September 1. The Day of Knowledge marks the beginning of every school year in Russia.
Dmitry Lovetsky / AP
The tracks of launching sky paper lanterns seen in this time exposure photo in St.Petersburg, Russia, late Thursday, Sept. 1 with the Savior of Spilled Blood Cathedral in the background. Some hundreds of lanterns were launched into the sky from Mars field as a flashmob action.