The cost of adding a feature isn't just the time it takes to code it. The cost also includes the addition of an obstacle to future expansion. The trick is to pick the features that don't fight each other.

The core of what I do is solve problems, whether that's in graphic engine flow or rockets. I like working on things that are going to have an impact one way or the other.

One of the reasons microcomputers progressed so fast is people are willing to accept crashes. It's faster to build something and try it, even if it means you'll have to rebuild later... If you spent too much time building and massaging one vehicle, you don't learn anything.

The great games are the space sims and driving sims and these experiences where you're basically sitting at a table with nothing happening in front of you. A lot of interesting things are evolving there. There are great games that can be made.

The similarities between commercial airplanes and automobiles are striking. It's all about safe and efficient transportation using the latest technology and the best fuel efficiency.

Twenty-five years ago, the notion was you could create a general problem-solver software that could solve problems in many different domains. That just turned out to be totally wrong.

For the past few years I have engaged in several inappropriate conversations conducted over Twitter, Facebook, e-mail and occasionally on the phone with women I have met online.

Russia has conducted a coordinated cyberattack on state election systems and hacked critical infrastructure. They have used social media to sow chaos and discord in our society. They have beaten and harassed U.S. diplomats and violated anti-proliferation treaties.