A psychologist has come up with a formula for parents struggling to find the perfect toy for their children this Christmas. Dr.Cliff Arnall,who has previously come up with calculations for the happiest and most depres...A psychologist has come up with a formula for parents struggling to find the perfect toy for their children this Christmas. Dr.Cliff Arnall,who has previously come up with calculations for the happiest and most depressing day of the year,reckons that mathematics can be used to展开更多
文摘A psychologist has come up with a formula for parents struggling to find the perfect toy for their children this Christmas. Dr.Cliff Arnall,who has previously come up with calculations for the happiest and most depressing day of the year,reckons that mathematics can be used to
