What makes this story so remarkable is that throughout my early childhood I had ongoing learning difficulties, particularly in mathematics. I struggled to learn the multiplication table, and no matter how hard I tried, I simply couldn't remember 6 times 7 or 7 times 8.

While neurological studies have tried to identify components responsible for fear and greed, the impact on finance is less clear.

If you rank the top 50 one-day moves in the S&P 500, a fair number of those happened within the last five or 10 years. That tells you that we're in a different, riskier market now.

More and more investors may be coming into markets everywhere but that doesn't mean that the markets are really getting more and more efficient, even in the United States. It does mean that there is more access for savvy investors who watch the money flows.

After 'Psychonauts,' we could have laid off half our team so that we'd have more money and time to sign 'Brutal Legend.' But doing so would have meant breaking up a team that had just learned how to work well together. And what message would that have sent to our employees? It would say that we're not loyal to them, and that we don't care.

What I like about sceptics is that in good science you need critics that make you think: 'Crumbs, have I made a mistake here?' If you don't have that continuously, you really are up the creek. The good sceptics have done a good service, but some of the mad ones I think have not done anyone any favours.

We need to get the corporate money out of the political system and return democracy to the people.

One should live between extravagance and meanness. Don't save money by starving your mind. It is false economy never to take a holiday, or never to spend money for an evening's amusement or for a useful book.