An entrepreneur must deal with more uncertainty than a professional with a well-defined role.

When I was starting out, I followed along the path that seemed to be marked out for me - from high school to college to law school to professional life.

People don't want to believe that technology is broken. Pharmaceuticals, robotics, artificial intelligence, nanotechnology - all these areas where the progress has been a lot more limited than people think. And the question is why.

Credentials are critical if you want to do something professional. If you want to become a doctor or lawyer or teacher or professor, there is a credentialing process. But there are a lot of other things where it's not clear they're that important.

Normal television limits what you can do. With science fiction, you can exercise your imagination more. I fell in love with it.

I got really involved in science research and the science of meditation.

My latter schooldays and my university days were during the war, when science - physics, in particular - was a very important and glamorous subject. A lot of us felt that if we couldn't get into science, we might try engineering or medicine.

It's a fallacy, long rebuffed by science, that humans use only about 10% of their brainpower. But it is true about most summer movies. Pouring their wizardry into special effects and well-choreographed fights, warm-weather action films rarely challenge the viewer with grand notions or beautifully baffling imagery.