Pupils share a joke during their outdoor theatre class at Valmieras Viestura Secondary School in Valmiera, Latvia, on April 29, 2021, during the ongoing coronavirus (Covid-19) pandemic. - In areas with lower infection rates, the Baltic state of Latvia is allowing schools to hold open-air classes and the initiative is proving so popular that some hope it is here to stay. (Photo by Gints Ivuskans / AFP) / TO GO WITH AFP STORY BY IMANTS LIEPINSH