instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
The high points in a transverse wave are called crests.
answer:
What are the high points in a transverse wave called?


question:
Water can be boiled to kill giardia and most other pathogens.
answer:
Water can be boiled to kill giardia and most other what?


question:
When the core of a star begins to run low on hydrogen, it contracts.
answer:
What happens to the core of a star when it begins to run low on hydrogen?