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

Input: Consider Input: The seven unique crystal types are defined by faces parts of themselves (parts that intersect at various angles).

Output: The seven unique crystal types are defined by what parts of themselves (parts that intersect at various angles)?


Input: Consider Input: Injuries can be prevented by getting proper rest and recovery.

Output: Injuries can be prevented by getting proper what?


Input: Consider Input: Interstellar medium consists of thinly spread gas and dust.
Output: What does interstellar medium consist of?