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

Ex Input:
Group 16 is called the oxygen group.

Ex Output:
Group 16 is called what?

Ex Input:
Diffraction is the phenomenon in which light and sound waves become circular at the point source of a barrier.

Ex Output:
What is the phenomenon in which light and sound waves become circular at the point source of a barrier?

Ex Input:
Many glasses eventually crystallize, rendering them brittle and this?

Ex Output:
Many glasses eventually crystallize, rendering them brittle and this?