I visited the University of Pittsburgh today to give a colloquium. I was supposed to have come in February but my plane was cancelled because of a snow storm. This was not the really big snow storm that closed Washington, DC and Baltimore for a week but a smaller one that hit New England and not the DC area. My flight was on Southwest and I presume that they have such a tightly correlated flight system, where planes circulate around the country in a “just in time” fashion, that a disturbance in one part of the country affects the rest of the country. So while other airlines just had cancellations in New England, Southwest flights were cancelled for the day all across the US. It seems that there is a trade off between business efficiency and robustness. I drove this time. My talk was on the finite size effects in the Kuramoto model, which I’ve given several times already. However, I have revised the slides on pedagogical grounds and they can be found here.