instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
When light passes from one medium to another, it changes speed.
answer:
When light passes from one medium to another, it changes what?


question:
Poles parts of the planet does solar energy have difficulty reaching.
answer:
What parts of the planet does solar energy have difficulty reaching?


question:
Muscular dystrophy is a a wasting disease.
answer:

What type of disease is muscular dystrophy?