Use your hands for a moment. Grab that bottle on your desk and unscrew the cap. Or get a pencil or pen and write your name. You might already be using your hand to read this story on your phone—that ...

How to Make Hydraulic Powered Robotic Arm from Cardboard In this video I show you how to make robotic arm from cardboard, it's quite fun to plaw with. Especially by moving coca cola cans. You need: ...