That's a term that I really like - 'permissionless innovation' - because anybody who has an idea and has a solution can tap into or can leverage the Bitcoin blockchain.

We are very excited about the use of blockchain, whether it's Bitcoin or not, but we are as enthusiastic as ever about Bitcoin as a global currency and, really more importantly, Bitcoin as a global financial rail.

You just can't bifurcate bitcoin currency from the technology. Bitcoin will always need a monetary base.

To be a more efficient, faster, and cheaper way to send money around the world, you have to be able to get in and out of Bitcoin. You need to have a liquid exchange on either end of the corridor.

A lot of what's happened with my career has been because of the Internet. It's a way for me to reach fans directly, especially with music.

We already have - thanks to technology, development, skills, the efficiency of our work - enough resources to satisfy all human needs. But we don't have enough resources, and we are unlikely ever to have, to satisfy human greed.

It's a blessing in a scientific career - the almost daily thrill of scientific discovery.

Basically, a manager's job is to make other people more productive. What's one really good way to do that? Do the work that is getting in their way. Which means find out what kind of important work your developers dislike the most, and do it for them.