I believe in myself. I believe in the hands that work, in the brains that think, and in the hearts that love.

I think a lot of becoming an entrepreneur is something which people have to learn just from getting out there and giving it a go, and having to learn the art of survival.

Have passion for what you do; believe in yourself and your product and your customer; persevere; delegate; listen. Have fun. Today, I add: "Do good".

All successful people - not just entrepreneurs - have got things wrong over and over again before finding the right solution.

Learn to live on the edge.

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.

My parents brought me up with this philosophy. You must do things. You mustn't watch what other people are doing. You must not listen to what other people are doing.