Cardboard Hydraulic Robot Arm

If you're into robotics, and want to introduce the basics of hydraulic robot arms to children, here's a project you won't be able to resist!

This cardboard hydraulic robot arm doesn't even give you the chance to say: "oh, it's too hard to find the metal pieces to build it!" as it is assembled entirely out of cardboard and duct tape.

Definitely a project to keep you entertained (as well as your kids) for a while.