Email is not going to disappear. Possibly ever. Until the robots kill us all.

Start out by making 100 users really happy, rather than a lot more users only a little happy.

Cultures that don't laugh at themselves are cults.

If everything you do works, then you're not taking many risks and probably aren't innovating either.

Many people with jobs have a fantasy about all the amazing things they would do if they didn't need to work. In reality, if they had the drive and commitment to do actually do those things, they wouldn't let a job get in the way.

Part of the excitement was just seeing how the world would respond. I kind of like uncertainty to some extent, because it's a little bit of suspense and excitement and adventure, almost, right? And you can learn a lot even if things don't work out. But not everyone likes adventure. A lot of people seem to be against uncertainty, actually. In all areas of life.

Bitcoin may be the TCP/IP of money.