This week's gadget fits into the wheel of your bicycle and writes in LED light. It's called the Fuze Bike Wheel Writer 2.0. It allows you to program messages using its iPhone app and then show that message through the LEDs you put on your wheel. Offers 63 different LED patterns that are built into the device, and it can be set to read out your current pedaling speed in lights on the bike wheel through an adapter. It's a great toy for kids. And it's only $19.99.