An iPhone / iPod Touch wallpaper featuring Rainbow Dash's cutie mark and a stainless steel background. Made by me in photoshop. PLEASE use this if you like it, but PLEASE give credit when modifying it!!! I am really proud of this one, as I think it turned out really nicely (I personally use this as my background!) Thanks for understanding!
20 minutes spent on one episode will answer your question. Besides, there are trillions of forum responses, a handful of documentaries, etc, that should well inform you; I have naught the patience to explain it.