Today has been a very exciting day. First off, About.me has been acquired by Aol, as good friend Tony Conrad writes about on his blog. A great deal on both sides, I think Aol got a steal and a great team here. Second, one of Audrey’s earliest investments Wakemate has finally shipped their first version, which I’ve been using the past two nights and has been great. (I’m averaging 60 so far.) Reserve your Wakemate here.

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.