'If you're happy and you know it, clap your hands.' That's what they teach the world leaders of tomorrow, in pre-school groups around the globe. And what do those tiny students learn when they put this into practice at those eminent educational establishments? That when you clap your hands, all the others clap their hands too. Glee is fun - and contagious too. And is it true that if you spread a little happiness, you will create a little happiness?