|One year when he was teaching at the Institute for Advanced Study in Princeton, it was time to set examinations. |
When Einstein handed over the exam papers to his teaching assistant, the assistant noted that it was the same paper that Einstein had set for that class the year before.
The assistant queried the master, “Isn’t this the same exam you gave this class last year?”.
“Yes, yes it is.” replied Einstein.
Emboldened, the assistant asked, “But how can you give the same exam to this class two years in a row?”
“Because,” Einstein replied, “the answers have changed”.