The BCS theory of superconductivity, which was published in 1957, marks its 50th Anniversary with a symposium at Brown University. Leon Cooper, the "C" in BCS and for which the "Cooper pair" was named after, was the honoree at this symposium.
This article brought up something that I've mentioned earlier, that Einstein also dabbled in trying to come up with an explanation of superconductivity, but failed. Of course, as Cooper mentioned in the article, he didn't have the quantum theory of metals at that time, so he was certainly severely handicapped.
So happy birthday, BCS Theory!