Albert Einstein.

The great Albert Einstein while employed by Oxford University in 1942 give the science class a set of questions ,During the test a member of staff noticed that the questions posed by Albert where exactly the same questions that Albert has posed the previous year.Panic broke out among the staff ,when everyone realized that the great man had made a mistake by posing an exam paper that had being repeated.
Albert was taken a tea room where the head of the University confronted the great man about his grave mistake.
on hearing the accusations Albert smiled to himself and replied
"my dear man,i know the questions are the same as last year,but the correct answers are entirely different than last year ,such is the speed of modern science."