TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Do particles collide more in two reactants fluid they are both in fluid forms or solid forms.

SOLUTION: Do particles collide more in two reactants when they are both in fluid forms or solid forms?

PROBLEM: While the numerical aperture can be used to compare resolutions of various objectives, it does not indicate how far the lens could be from the specimen.

SOLUTION: While the numerical aperture can be used to compare resolutions of various objectives, it does not indicate how far the lens could be from the what?

PROBLEM: Radioactive decay can give off energy and particles.

SOLUTION:
Radioactive decay can give off energy and what else?