I rely far more on gut instinct than researching huge amounts of statistics.

With space travel, [it's] no different. You know, in 1990 I read the name Virgin Galactic Airways. Loved the name. And set out to try to find an engineer or rocket scientist in the world who could build a safe, reusable rocket that could take people to and from space and we could start a whole new era of commercial space travel.

The best advice I could give anyone is to spend your time working on whatever you are passionate about in life.

So unlike having to convert, you know, all the cars' or all the lorries' petrol stations, once you've actually got the clean fuels, it's relatively easy to, you know, get it to the airplanes.

I am impressed with just the enthusiasm for life and the fact that some of these people are in their 80's, even 90's, and they're absolutely determined to get out there and make a difference.

I also know, as an entrepreneur myself, you face new obstacles every day and you need to have the perseverance to see them through.

I have enjoyed life a lot more by saying "yes" than by sayings "no".