TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: A theory is another name for a broad explanation that is supported by a great deal of evidence.

SOLUTION: What is another name for a broad explanation that is supported by a great deal of evidence?

PROBLEM: There are three quarks in each proton and neutron.

SOLUTION: How many quarks are in each proton and neutron?

PROBLEM: A(n) electroscope is used to study charge.

SOLUTION:
What device is used to study charge?