What was the name of the Albert Einstein episode that just aired?

An Albert Einstein special just aired this past Sunday 3/20 or Monday 3/21 and I’m trying to figure out which channel was it (History, AE, Bio) and at what time? I would like to see if it is going to air again. I tried looking for it on channel guides but haven’t come across anything. The advertisements for it started off with something like ” a man was sitting in a bus going through a tunnel when he thought up the theory of relativity ..” Any help would be greatly appreciated!