Children jubilantly celebrate at a ceremony in Kazminskoye, Russia, in 2015 (Eduard Korniyenko / Reuters) Here’s something that has always puzzled me, growing up in the U.S. as a child of Russian parents. Whenever I or my friends were having our photos taken, we were told to say “cheese” and smile. But if my parents also happened to be in the photo, they were stone-faced. So were my Russian relat