There are plenty of bionic hands out there at this point, but how many of them are powered by rockets? Not many. The Vanderbilt arm, however, breaks the trend of arms that aren't powered by mini rockets. Finally!

The wee rocket engines on board the Vanderbilt Arm provide a stronger force and faster movement on the artificial muscles than other artificial limbs, and there's no need for batteries. All it needs is a small power source that's about the size of a pencil. The source contains a special catalyst that causes hydrogen peroxide to burn, which creates steam, which then opens and closes a bunch of valves that run spring-loaded joints. In the end, it provides a powerful prosthetic arm that's an alternative to what's out there now. Go go rocketarm! — Adam Frucci

Vanderbilt, via MedGadget