Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Ex Input:
Changing the shape of an elastic material gives it potential energy.

Ex Output:
Changing the shape of an elastic material gives it what type of energy?


Ex Input:
An object attached to a spring sliding on a frictionless surface is an uncomplicated type of simple harmonic oscillator.

Ex Output:
An object attached to a spring sliding on a frictionless surface is an uncomplicated type of what device?


Ex Input:
An ether is an organic compound in which two hydrocarbon groups are bonded to the same  oxygen atom.

Ex Output:

An ether is an organic compound in which two hydrocarbon groups are bonded to the same atom of what?