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

Example Input: Most of the gray matter is on the surface of the brain, surrounding white matter.
Example Output: Most of the gray matter is on the surface of the brain, surrounding what other type of matter?

Example Input: Moving air masses is the main reason for weather change.
Example Output: What is the main reason for weather change?

Example Input: All cells share the characteristic that they need energy.
Example Output:
Which characteristic is shared by all cells?