I'musuallyfairlyskepticalaboutanyresearchthatconcludest...
問題詳情：I'musuallyfairlyskepticalaboutanyresearchthatconcludesthatpeopleareeitherhappierorunhappierormoreorlesscertainofthemselvesthantheywere50yearsago.Whileanyofthesestatementsmightbetrue,theyarepr...