Einstein and her driver

Einstein used his trusted driver to go to lectures and teach at the university.  His driver not only drove his car, but was always present during the lectures among the listeners, so that he had mastered Einstein's topics! 

 One day, while on the way to university, Einstein said out loud that he felt very tired?

 His driver suggested that they change their places and…

 He should give a speech instead of Einstein because Einstein was a professor in only one university and nobody knew him in the university where he was giving a speech and of course they couldn't distinguish him from the main driver. 

 Einstein agreed, but was a little hesitant about what he would do if he was asked tough questions after the speech.

 Anyway, the driver's speech was done in a great way, but Einstein's idea was right out of the water.  At the end of the lecture, the students started to ask their questions. 

 Meanwhile, the smart driver said: The questions are so simple that even my driver can answer them. 

 Then Einstein got up from the audience and easily answered the questions to the extent that it surprised the audience!