Ever had to ‘waste’ your time typing in those computer-generated words called ‘captchas’? Little did you know, you were contributing by your efforts to the spread of human knowledge!!!
Another project by that same guy explains how you can learn a foreign language for free – while doing the same thing.
(Note: I always try to embed videos, but TED currently doesn’t seem to like to be embedded on WordPress… Let me know if this talk gets uploaded to YouTube – this way it can get embedded directly into the post 🙂 )