Instructables user, TheNaib, has written a tutorial on how to create a solar thermal water heater for under five dollars. It will involve a fair amount of DIY, but nothing too complicated. designed as a fun project, but with some tweaking it could
David just introduced us into our next project which will be a coil gun. This is a very high tech, high powered coil gun. Although ours probably won't be as cool as this ours will be made from the circuit from the flash of a disposable camera.