We're fortunate enough to live on a planet that's bathed in thousands of times more energy than we use and that's stocked with thousands of times more water, raw materials, and even food-growing potential than we need.

AI does not keep me up at night. Almost no one is working on conscious machines. Deep learning algorithms, or Google search, or Facebook personalization, or Siri or self driving cars or Watson, those have the same relationship to conscious machines as a toaster does to a chess-playing computer.

Neural implants could accomplish things no external interface could: Virtual and augmented reality with all five senses; augmentation of human memory, attention, and learning speed; even multi-sense telepathy - sharing what we see, hear, touch, and even perhaps what we think and feel with others.

Everything good and bad about technology would be magnified by implanting it deep in brains. Is the risk of brain-hacking outweighed by the societal benefits of faster, deeper communication, and the ability to augment our own intelligence?

The Internet is a very powerful tool; unfortunately it's starting to get a little saturated.

First, how do we give everyone a fair shot at opportunity and security in this new economy? Second, how do we make technology work for us, and not against us - especially when it comes to solving urgent challenges like climate change? Third, how do we keep America safe and lead the world without becoming its policeman?

On climate change, the science is clearer about what you need to do to get a real impact than... on counterterrorism.

Digital technology has several features that can make it much easier for teachers to pay special attention to all their students.