We need new medical approaches to preventing and/or curing disease. We need new scientific approaches to generating, storing, and being more efficient with energy. Maybe we need more space exploration. Maybe we need more undersea exploration.

There are so many startups out there raising money. I don't think this is a bad thing. It's a good thing. Entrepreneurship is in vogue. Innovators are innovating. Makers are making.

It's not easy for an entrepreneur to find the time to blog. But for those who do it, it is a great tool to communicate with the various stakeholders in their business and build a reputation for thought leadership.

The companies that do the best job on managing a user's privacy will be the companies that ultimately are the most successful.

The way I see it, the prize money is a reflection of my on-court performance, but the sponsorships are something more personal, connected more to people and fans, and to my values.

Personally, I had made a good amount of dough for a 30-year-old guy, but I didn't know a thing about money. I'm not a dumb guy, but I couldn't figure them out.

I think Russell Brand's books should be criticised for being rubbish - but it is true that there's a professional class of opinion-former who has a financial interest in their job not being taken away.

The only thing I did well was learn how to make money.