If you're bored

There's this really cool website TED.com, which is the website from this annual high powered technology and design conference, and they have talks from 5-20 minutes by people at the top of every field, from violinists to astrophysicists, talking about some cool project. Just browsing is pretty fun. I just found this talk about a device that costs 25 bucks, and acts as a refrigerator in third world environments without electricity or gas inputs.