The idea is that a person would operate a robotic device remotely, but would receive or "feel" signals from a dangerous environment, such as a nuclear reactor or the surface of another planet.

CNN: Fingerprint study offers inspiration for robotics research

It is extremely rare on earth as it is created during very active nuclear reactions, most commonly found on the surface of the sun, but here can only be found as a by-product of the maintenance of nuclear weapons.

CNN: Mining the moon for a nuclear future

Decisions were made a long time ago that this transuranic waste, a legacy from our nuclear weapons days, should not just sit around at the surface waiting for an accident to happen, but should be put in the safest, most isolated place on Earth, so that nothing can happen to it.

FORBES: Nuclear Waste Gone from Hurricane Sandy's Path