Talent of student Tesla

Nikola Tesla was called 'photographic' because of his unimaginable talent. Because, he would memorize what he saw once. One day, when all the students start doing the maths on the Math Teacher Board, the exceptional Tesla stays silent. When the teacher asks him a question, Tesla answers the numbers orally in a way that the teacher suspects - this student must have memorized. So he made some maths on his own and gave Tesla দিলে the correct answer to all the maths, and the teacher was so surprised that he called Tesla a "terrible genius"!