Neither did I. And if you did indeed know what a Blumlein Pair is, go to the head of the class and tell us about the other 128 Patents Alan Blumlein has, Mr. Smarty Pants.
Mr. Blumlein was an amazing engineer who’s life-span was very brief (1903-1942) Recording, Television, and Radar were his fields of expertise. Read about his life here.
A Blumlein Pair is a preferred way to record stereo performances with two microphones. The technique is one we all should know next time you get called out to broadcast or record the local Symphony with 20 minutes notice. Go to this link, print it out, and place it in your mic locker for safekeeping. Blumlein Pair on Wikipedia