Not sure if this was discussed at length before. But, I have to wonder what the professor knew or found out when Sam returned to class in the credit scene. 1. Did he come to the realization in Sam's mental meltdown on stage that he was on to something not known to humans before? 2. Did he put 2 & 2 together that Sam and this Alien robotic race worked together. Thusly inquired about scientific theory Sam had spoken in similar fashion to Blur? Finding out why Einstein was wrong and completely erradicating known and accepted thought on mathematics, physics and science? See Sentinel's explanation on the laws of physics regarding the space bridge? 3. Or did he have an encounter with Bee or Optimus when talking with Sam before returning to class?