Two Fun Things In One - Bicycle Light DIY Kit

I found this fun little kit while looking up info on bicycle lights. I remember when I was in college, most bicycle lights did not have batteries, but friction generators that used a small wheel that ran along your rear rim to generate power for the light. They were somewhat heavy and cumbersome, and didn't produce a very strong light (this was, of course, in the days before LEDs). Now there's a kit out for frictionless dynamo lights for your bicycle. Nothing like combining some science learning with DIY ingenuity and reducing waste (batteries) as well! While I run rechargables in my bike lights with good success (the LEDs draw so little power that good rechargables actually last a long time in them), I can't resist the draw of free power from this little magnetic generator. I think I might have to order one!