How to Spend a Trillion Dollars

If you had a trillion dollars and a year to spend it for the good of the world and the advancement of science, what would you do? It's an unimaginably large sum, yet it's only around one per cent of world GDP, and about the valuation of Google, Microsoft or Amazon. You could end global poverty. You could settle on the Moon and explore the solar system, or... A call to arms: these are all things we could do, if we put our minds to it - and our money. The ultimate thought experiment.