Here’s an update I just posted to yesterday’s piece on organized phone theft rings in London:

I forgot to apply one of the core tenets of Brian Kernighan’s wonderful book Millions, Billions, Zillions ($19 in hardcover from Amazon; BookShop.org link to indie booksellers): always do some back-of-the-envelope double-checking of the math in news stories. 1.5 miles of aluminum (or even aluminium) foil from Costco is just 12 rolls at 200 meters each. I wouldn’t blink my eyes at someone with a dozen rolls of foil in the cart at Costco.