{ science.energy: Biodiesel

Another theme of interest to me is practical energy and how not to give money to the Fat Evil Oil System (FEOS for short). I got some articles in how to do your own biodiesel out of used cooking oil. Here there is some interesting ones:

• Make your own biodiesel >>
  Very extensive and detail.
• Fabrica tu propio biodiesel >>
  Same as first but in Spanish.
• Biodiesel: A Primer >>
  More practical less science.

I guess the more interesting facts on this is that if you can get the used oil for free (that is, usually, a hassle to get ride off) and you have the time; can be a very profitable hobby at a personal or family scale. Applied to a small business (For example Food production and delivery) will drastically cut down cost in transportation.
In a farm environment will exploit crops unsuitable for food and help reduce cost of production and transportation. More surprising yet is the fact that the best producer of vegetable oil is an algae that grows in human or animal waste water, imagine the use of city sewers to produce this energy. Not a nice job to do, but I guess we'll have to omit the sense of smell and disgust in robots for this task.