I don’t like to write about the same as everybody writes, there is too much redundant information on the Internet. So insted of writing how to buil a cloud chamber (booooring, Guillem. Everybody know what it is): http://en.wikipedia.org/wiki/Cloud_chamber. Basically you can have a 30 dollar particle detector in your bedroom, thats is exactly what happens in my bedroom 🙂 . I am going to write about my 1-year experience with it.
The genious thing that somebody told me is to add MAGNETS to the chamber! So you can see the curving of the tray of the charged particles!
This is the bottom of the cloud chamber I built last year. (With the magnets)
Another important thing is the ilumination. From my experience I really like 8-leds flashlight.