This inventions activity goes along with the Documentary 101 Gadgets that Changed the World produced by the history channel. You can buy it at www.historychannel.org or through amazon. It is very quick and funny, but best of all very highly engaging for kids and sparks excellent conversation so they understand life before the gadget that was invented. I use this to check off the INVENTIONS guidelines I have and then follow it up with the inventions essay the kids have to write. I highly suggest teaching inventions with this handout (all fill in the blank as they watch) instead of reading a textbook. Purchasing the video is definitely worth it!!