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

Ex Input:
When light passes from one medium to another, it changes speed.

Ex Output:
When light passes from one medium to another, it changes what?


Ex Input:
Hybridization model model helps explain molecules with double or triple bonds.

Ex Output:
Which model helps explain molecules with double or triple bonds?


Ex Input:
Gene expression and protein synthesis are usually considered the same molecular process.

Ex Output:
Gene expression and what else are usually considered the same molecular process?