I have invested in four social networks. More than any other. But that's in Russia and Poland.

Fundamental physics is like an art more or less. It's completely non-practical, and you can't use it for anything. But it's about the universe and how the world came into being. It's very remote from your daily life and mine, and yet it defines us as human beings.

Big Internet companies on average are capable of generating revenue of $1 million per employee, and that compares to 10 to 20 percent of that which is normally generated by traditional offline businesses of comparable size.

Facebook didn't know how successful Zynga would be.

The hardware and the software used in the Breakthrough project will be compatible with other telescopes around the world, so they too can search for intelligent life.

The polling of Internet users shows that friends recommendations are the most reliable driver behind purchasing decisions. Right now that market is largely untapped. Facebook and other social networks can allow that to happen.

I'm trying to learn from various corners of the world.