How To Make A Bettery-Free Flashlight

MAKE has a cool tutorial on how to build a flashlight that doesn't use batteries.
"In this project, you will make a flashlight that works without batteries. Even more amazing, you can recharge it in three minutes and it will run for more than 24 hours. Because the ultra capacitors can be recharged thousands of times, you may save the environment from ever receiving an old flashlight in the trash system."
how to build a battery free flashlight