Running out of juice when you're chatting on your mobile, battling aliens on your PSP or listening to your iPod is one of the most annoying things known to mankind. Well it?not, but it's irritating nonetheless. Thankfully portable gizmos are rechargeable, so you merely plug them into the nearest socket and wait.
But what do you do when you're nowhere near a power source? Well it just so happens that, unless you're reading this from the Planet Tharg, you're always near a power source: the sun.