On 17 March 1967, the 26-year-old David Sainsbury wrote out a cheque for GBP5 and established the trust which would become the Gatsby Charitable Foundation. Gatsby's purpose was ambitious: to make the world a better place by taking on some of the social, economic and scientific challenges that face humanity. In recent years, Gatsby has spent around GBP50m annually on charitable activities, and by its 50th anniversary in 2017 it will have spent over GBP1bn on programmes that range from reducing poverty in Africa to raising the standard of technical education, investigating how plants fight disease, and finding out how the brain works. But despite Gatsby's wide reach and the level of its donations, it has always functioned discreetly and out of the public eye. Georgina Ferry's in-depth account reveals its achievements and invites us to question how the super-rich - and even the moderately affluent - might spend their money more wisely and for the common good.