instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Fermat’s principle states that light will always take the path of the least amount of time.
answer:
Fermat’s principle states that light will always take the path of least amount of?


question:
Antifreeze lowers it the freezing temperature of the water in car radiators.
answer:
What does antifreeze do to the freezing temperature of the water in car radiators?


question:
There are three types of galaxies.
answer:

How many types of galaxies are there?