Theory of Relativity wonder to answer Tweedledum's request.
Not the most creative way to express it: I guess, Einstein standing before a chalk board with E=mc2 written on it. I am a bit busy right now so this comes with no civilopedia description, sorry about that.
Use it as a scientific wonder, to give two techs or double research output or something similar.
Theory of Relativity 2016-10-05
Theory of Relativity