Hardware

Do you have an office that gets a little warm at times?  Did you notice you have a lot of extra computer fans (CPU, Power Supply, Case) accumulating?  How about making a very quiet Tree Fan for your desk:

Number and size of fans as well as layout patterns are almost limitless...

Parts List:

1. Old CPU, Power Supply, and Case fans.
2. Old AC/DC 12V adapter.
3. Two wire nuts.
4. Various 6/32 x ? machine screws, washers, and nuts.  Depends on the fans you have.

 
As  Seen In  Popular Science, February, 2008: