I've always been more interested in organisms that can move on their own than in stationary plants. But when I canoe or hike along the edge of lakes or oceans and see trees that seem to be growing out of rock faces, I am blown away. How do they do it?

The failure of world leaders to act on the critical issue of global warming is often blamed on economic considerations.

The future doesn't exist. The only thing that exists is now and our memory of what happened in the past. But because we invented the idea of a future, we're the only animal that realized we can affect the future by what we do today.

If America wants to retain its position as a global power, its president must listen to the people and show strong leadership at this turning point in human history.

We are drowning in partisan rhetoric that is just true enough not to be a lie; in industry-sponsored research; in social media's imitation of human connection; in legalese and corporate double-speak.

Transactive memory works best when you have a sense of how your partners' minds work - where they're strong, where they're weak, where their biases lie. I can judge that for people close to me. But it's harder with digital tools, particularly search engines.

I think it's going to end up a lot like the Internet. Some countries try to regulate the Internet - bitcoin will be very much like that. It will be legal, and there will be some countries with currency control.

The Internet made fame wack and anonymity cool.