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

Input: Consider Input: In pupa stage of their life cycle do insects begin developing their wings.

Output: In what stage of their life cycle do insects begin developing their wings?


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

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


Input: Consider Input: In solids, particles can't overcome the force of attraction between them because they lack kinetic energy.
Output: In solids, particles can't overcome the force of attraction between them because they lack what?