soda can solar

I love that this came from an automotive blog as a way to keep your cars warm in the winter!

http://blog.hemmings.com/index.php/2007/04/26/almost-free-garage-heat-just-drink-a-lot-of-soda/

OTHER LINKS TO SELF-MADE SOLAR HEATERS:

http://www.motherearthnews.com/Alternative-Energy/2006-12-01/Build-a-Simple-Solar-Heater.aspx

http://www.instructables.com/id/EMU06ULZ1MEY95WRNU/