The world’s smallest document camera is about the size of a pen and just a little larger than a regular-sized candy bar. The HoverCam Mini Scanner ($249) needs no wires since it plugs directly into the USB port on a computer. It can be used for Web conferencing, document scanning, creating video, and much more. You’ll find it compatible with both Mac and Windows systems, and you can carry it around in your pocket. So, it’s handy for a classroom teacher and just about everyone.