Add Yahoo as a preferred source to see more of our stories on Google. An expert shows how this classic cookware is spun on a lathe, tinned, and finished. In ancient times, copper was worked by hand ...

A group has created a levitating quadcopter consisting of 4 motors and 4 spinning magnetic arrays. By spinning the magnets over a copper sheet, the 105-lb quadcopter levitates. The magnetic levitation ...