When self-delusion and self-flattery enter the mind-set of a product team and the metrics they judge themselves by, like the first plague rat coming onto a ship, the end is practically preordained.

In Silicon Valley, where I worked at companies like Facebook and Twitter for the earlier part of this decade, Cuba was generally regarded, when it was regarded at all, as a technological curiosity.

If the world really does end, there aren't going to be many places to run.

If you'd come to me in 2012, when the last presidential election was raging and we were cooking up ever more complicated ways to monetize Facebook data, and told me that Russian agents in the Kremlin's employ would be buying Facebook ads to subvert American democracy, I'd have asked where your tin-foil hat was.

After my father died, we were pretty much wiped out financially as a family, so I decided to give finance a try.

We're fighters. We go out there, and we'll open a window of opportunity, and they're only open for so long, and we have to take advantage of that time right then. When I did it, I was 30-31 years old. Maybe it was a little too late that I should have did it, but I did it right. I was okay with the money that I got, the money that I made.

You cannot simply put more money into the same system and get better results, so we will need to reform and innovate in the delivery of education.

I work very regular hours, roughly 9 to 5:30. I think I have it much easier than a lot of parents. I just sit at home, I have a very flexible timetable, and I'm very fortunate in that I don't have money problems. I have lunch with my wife at home. I don't have to commute, so I have much more time with my family.