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

Example Input: Superior sagittal sinus is the largest of the sinuses.
Example Output: What is the largest of the sinuses?

Example Input: 10 million years long can a large star be on the main sequence stage.
Example Output: How long can a large star be on the main sequence stage?

Example Input: Nuclear fusion, which results because of great pressure at the center of a star, causes stars to shine.
Example Output:
What process, which results because of great pressure at the center of a star, causes stars to shine?