If we can't have an open and honest debate about the value of ideas in a university in Glasgow, or Boston, or anywhere else in the world, then where are they going to go?

When it comes to political engagement, I'm not a politician - I'm an engineer.

Increasingly we're seeing these ultra-partisan sites getting larger and larger readerships because people are self-selecting themselves into communities.

A lot of people in 2008 voted for Obama. I did not vote for him. I voted for a third party. But I believed in Obama's promises.

People sometimes say I broke an oath of secrecy - one of the early charges leveled against me. But it's a fundamental misunderstanding, because there is no oath of secrecy for people who work in the intelligence community. You are asked to sign a civil agreement, called a Standard Form 312, which basically says if you disclose classified information, they can sue you; they can do this, that and the other. And you risk going to jail.

You can't come up against the world's most powerful intelligence agencies and not accept the risk. If they want to get you, over time they will.

There's not much value to us attacking Chinese systems. We might take a few computers offline. We might take a factory offline. We might steal secrets from a university research programs, and even something high-tech. But how much more does the United States spend on research and development than China does?