A student once asked Albert Einstein, "Dr. Einstein, how many feet are there in a mile?" The student was amazed when Einstein replied, "I don't know.”
Sure that he was only joking, the student pressed him for an answer. Surely Einstein would know a simple fact that every schoolchild is required to memorize. But Einstein wasn't joking. He really didn’t know. He explained this gap of knowledge like this: "I make it a rule not to clutter my mind with simple information that I can find in a book in five minutes."
Albert Einstein was not interested in trivial data. His passion was to explore the deep things of the universe.