City Equations

The first data set they analyzed was on the economic productivity of American cities, and it quickly became clear that their working hypothesis — like elephants, cities become more efficient as they get bigger — was profoundly incomplete. According to the data, whenever a city doubles in size, every measure of economic activity, from construction spending to the amount of bank deposits, increases by approximately 15 percent per capita.

A Physicist Turns the City Into an Equation on NYTimes.com. A fascinating article about some constants between cities, and a bit at the end about how laws are different for corporations.

Airport Security

It’s not that the terrorist picks an attack and we pick a defense, and we see who wins. It’s that we pick a defense, and then the terrorists look at our defense and pick an attack designed to get around it. Our security measures only work if we happen to guess the plot correctly. If we get it wrong, we’ve wasted our money. This isn’t security; it’s security theater.

Bruce Schnier on why airport security is A Waste of Money and Time in the New York Times.