Seebeck effect

Ever wondered what to do with all that wasted heat off your car's engine:

Power all the electronic systems with it, get rid of the alternator. Here's how it works:

http://tellurex.com/pdf/Tellurex_pg1.pdf

The new Prius is using this concept (sort of):'

http://theweeklydriver.com/blogs/70/Cool-Toyota-Prius-Even-Coloer-In-2010-With-Solar-Powered-Air-Conditioniing.html