I have to say, though... I think both Franklin and the Catedral may have been overpowered. Franklin (Age II leader) gave me on average +6 Sci per turn for 8 turns, with everyone else getting about 1 Sci per turn from him. That's pretty huge.
The Cathedral (Age II wonder), for 13 Resources, turned each of my Age A temples into an Age I theater+lab, at a cost of 1 Resource each. I don't think it's quite as OP as Franklin, though. Franklin + Impact of Science, or Progress, *or* Technology...