DR. J. J. HOPFIELD'S description of spiral cracks in glass capillary tubing 1 reminds us that similar cracks were observed some ten years ago with thinwalled tubing, during the development of ...

Large quantities of this tubing were being handled, and frequently, when it was being cut into lengths, a spiral or rather helical crack would fly along the piece.

How do you make a robot hand? If you are [Robimek], you start with some plastic spiral tubing, some servo motors, and some fishing line. Oh, and you also need an old glove. The spiral tubing (or ...