Some actors have to master a difficult accent or wear an uncomfortable costume to pull off a role. “Genius” stars Geoffrey Rush and Johnny Flynn needed to learn some theoretical physics.
Their roles as the older and younger Albert Einstein, respectively, demanded that they rapidly rattle off complex equations as if delivering lines of casual conversation. (As befits two men playing the same person, they sometimes finished each other’s sentences in an interview with TheWrap.)
“We had to reel off equations and we had no… clue what we were saying,” Flynn said.
“I did,” stage-whispered Rush.
“He did,” Flynn agreed.