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

[Q]: A theory is another name for a broad explanation that is supported by a great deal of evidence.
[A]: What is another name for a broad explanation that is supported by a great deal of evidence?


[Q]: Sodium-potassium pumps help nerve cells establish a voltage across their plasma membranes.
[A]: Sodium-potassium pumps help nerve cells establish a voltage across their what?


[Q]: Nuclear bombardment procedure helps modern nuclear physics convert lead into gold.
[A]:
Which procedure helps modern nuclear physics convert lead into gold?