The purest case of an intelligence explosion would be an Artificial Intelligence rewriting its own source code. The key idea is that if you can improve intelligence even a little, the process accelerates. It's a tipping point. Like trying to balance a pen on one end - as soon as it tilts even a little, it quickly falls the rest of the way.

By far, the greatest danger of Artificial Intelligence is that people conclude too early that they understand it.

Anything that could give rise to smarter-than-human intelligence - in the form of Artificial Intelligence, brain-computer interfaces, or neuroscience-based human intelligence enhancement - wins hands down beyond contest as doing the most to change the world. Nothing else is even in the same league.

There's a popular concept of 'intelligence' as book smarts, like calculus or chess, as opposed to, say, social skills. So people say that 'it takes more than intelligence to succeed in human society.' But social skills reside in the brain, not the kidneys.

In addition to my job at American Express, I'm also chairman of the board of Symantec, one of the leading players in anti-virus and cyber-crime prevention software, so I know firsthand just how sophisticated many of these attacks can be.

For many oppositional movements, the Internet, while providing the opportunity to distribute information more quickly and cheaper, may have actually made their struggle more difficult in the long run.

To cure ALS medically is not economical. The realities are that it's difficult to find funding for research for a medical cure. I believe in developing technology as opposed to medical research. Technology can be economical.

Girls are being left out of the conversation when it comes to technology, led to think of tech as insular and antisocial without ever being given a chance to correct those perceptions.