In this instructable I took a USB cable and a old computer fan and made the fan USB compatable.
Step 1: Getting the usb.
Cut the USB cable to the desired length. Then Strip the cable so you see 4 wires. Cut or isolate the green and white wires. Now strip the red and black wires.
Step 2: Connecting the USB to the fan.
Twist the red wires with each other and the black wires with each other. Now your done, plug in and be cooled down.