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?

Whatever role the structure of the Internet plays in radicalization, the root causes are still primarily sociological and political, and they will perdure and manifest themselves somewhere, somehow, no matter what YouTube suggests for your next video when you watch a Milton Friedman lecture.

We're not living in a society that science actually dominates the conversation. We're living in a situation where some science is allowed and a lot of it's about policy. And when your science runs into a policy roadblock, all of a sudden the science starts to disappear.

Broadly, the meaning of life comes from how we interact with each other. The Internet can reconfigure space so that the right people are always next to each other.

Yahoo is still in many ways the definitive brand of the consumer Internet, but I don't think they can or should compete with Google any longer. That game is over.