The quantified self

At TED@Cannes, Gary Wolf gives a 5-min intro to an intriguing new pastime: using mobile apps and always-on gadgets to track and analyze your body, mood, diet, spending — just about everything in daily life you can measure — in gloriously geeky detail.

Journalist Gary Wolf spends his days in pursuit of the most fascinating things. As a contributing editor at Wired, he's written about technology, mushroom hunters, venture capitalists ...