While at Stanford last month, we had a long conversation with former Secretary of Defense William Perry about the nuclear dangers facing the world. We were struck by his provocative and frightening outlook: that the possibility of a nuclear catastrophe today is greater than it was during the Cold War. North Korea’s recent bluster only underlines the dangers.

In a recent post, I challenged Mark Kleiman's view that low-income people do not benefit at all from international trade.

Social media made him a star. He is a real estate mogul whose followers believe he speaks truth to power. As a result of his outspoken anti-establishment political posture and popularity, his party wants to shut him down.

Stanford foreign policy experts discussed flashpoints around the world at an OpenXChange event this week.