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

[EX Q]: Water contains 3 atoms.
[EX A]: How many atoms does water contain?

[EX Q]: Radioactive decay can give off energy and particles.
[EX A]: Radioactive decay can give off energy and what else?

[EX Q]: Shape notebook paper is folded to make an airplane, what physical property of the paper changes.
[EX A]:
When notebook paper is folded to make an airplane, what physical property of the paper changes?