There's a useful calculation being used by Wall Street, Silicon Valley and maths professors all over the world, and it predicts that the human race has only 760 years left to live. Using its formula, we can look at the world around us with new eyes. What is the chance that there are multiple universes? How long will Hamilton run? Will the US stock market continue to perform as well this century as it has for the last hundred years? And are we all doomed?