RIO DE JANEIRO, BRAZIL - "If my son loses a year in school, it won't make a difference to him in the future. But if I lose a child, it will. I'd rather lose a year than lose a son." Researcher Érika Andreassy, 47, has been working from home for almost five months with her two children, João Pedro Andreassy Castro, 15, and Camilo Augusto Andreassy Castro, 10, both students at . . .