Google Lectures & Captcha's

Google have a fantastic policy for keeping their staff up to spec on the latest technologies. They have lectures on a regular basis on a wide range of subjects. You can view them here: Google tech talks This is one that is very interesting, it explains a few things about captcha's, which you use every day (when a website asks you to type the text/numbers from a distorted picture to prove you are human). Then if you want to watch on he relates this wonderfully to the future of human computation: