The brands that will thrive in the coming years are the ones that have a purpose beyond profit.

Look, if you can indulge in your passion, life will be far more interesting than if you're just working. You'll work harder at it, and you'll know more about it. But first you must go out and educate yourself on whatever it is that you've decided to do - know more about kite-surfing than anyone else. That's where the work comes in. But if you're doing things you're passionate about, that will come naturally.

We have a business that some people feel pollutes, and I happen to agree with them. ... And so on the basis of trying to do good and, you know, hopefully turn a profit, what we did was we pledged that we'd put all the profits from our airline business into trying to develop clean fuels.

From the first days of my career as an entrepreneur, I have always used my own and my team's lack of experience to our advantage. In fact, at our first venture, Student magazine, we used our newcomer status to secure great interviews and generate publicity - people were excited about our new project and wanted to get involved. Our inexperience fed our restless enthusiasm for trying new things, which became part of our core mission.

In Syria, if [Bashar al-] Assad had just been a statesman and handed over the reigns in time, Syria would not be heading down the nightmare that it is today.

All in all, the internet is a force for good, providing young entrepreneurs with access to an incredible wealth of information, has changed the way we see the world and is also a great source of innovation and entrepreneurial opportunities.

I've used the Phoenix Centrifuge to replicate what the body's going to go through on the flight up. I've also done some gravity tests with ZERO-G [a charter-flight service in Arlington, Va., that uses modified Boeing 727s to simulate weightlessness], which went great.