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

[Q]: Particle accelerators can nuclear fusion in stars be simulated.
[A]: How can nuclear fusion in stars be simulated?


[Q]: Unicellular eukaryotes are protists normally.
[A]: What type of eukaryotes are protists normally?


[Q]: Another measure of the effectiveness of a machine is its mechanical advantage.
[A]:
Another measure of the effectiveness of a machine is its what?