TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: A concave lens is thicker at the edges than it is in the middle.

SOLUTION: What type of lens is thicker at the edges than it is in the middle?

PROBLEM: Resistors connected end to end are said to be in series.

SOLUTION: Resistors connected end to end are said to be in what?

PROBLEM: Springs or geysers do we call heated groundwater that erupts from the ground under pressure.

SOLUTION:
What do we call heated groundwater that erupts from the ground under pressure?