I'm not saying we don't have our set of problems - climate crisis, species extinction, water and energy shortage - we surely do. But ultimately we knock them down.

The day before something is a breakthrough, it’s a crazy idea.

I ended up realizing that NASA was unlikely to get me into space, or get me to the moon or beyond, and I needed some other way to drive this.

More than ever before in history, individuals can now band together to solve grand challenges. We face enormous problems, but we 'as individuals' have enormous power to solve them.

My father, who grew up picking olives on the Greek island of Lesbos, was a doctor. So my family expected me to become a physician.

I'm a nine-year old kid inside and my passion has been all my life to want to travel into space.

Large companies and government agencies have a lot to protect and therefore are not willing to take big risks. A large company taking a risk can threaten its stock price. A government agency taking a risk can threaten congressional investigation.