Check a video of the arm in action at the read link -- it's even niftier than it sounds.

ENGADGET: Rocket-powered mechanical arm might boost prosthetic tech

Since then, however, headset prices have tumbled, leading to several niftier offerings.

ECONOMIST: Brainwave controllers

Several of the niftier knots and straps that made their way into the factory-made riggings of the 19th century are identical in function and name to those of earlier British seafarers.

ECONOMIST: New uses for an old pastime