ON ROAD-SPEED SIGNS AND BLOOD NANOSENSORS: “An article in Wired reports about how drivers respond to dynamic speed display signs (with built-in radars by slowing down. FuturePundit wonders whether a cell phone tell that would tell you (unsolicited) when you’ve exceeded your calorie allotment would have a similar effect.” Well, I use the LiveStrong app on the iPhone, and I lost ten pounds — actually, a couple more than my goal — last semester, pretty painlessly. It doesn’t directly measure your calories consumed and expended, as you have to enter them. But it has a good database that covers most food and pretty much all exercise you’re likely to perform. It also tracks diet composition; I didn’t go Atkins but I did cut my carbs significantly, which I think helped, too.