给我一个Einstein的故事

One day Einstein is walking in the street. His friend meets him and says to him，“Einstein，you should buy a
new coat. Look，your coat is old!:But Einstein answers，“It doesn’t matter. Nobody knows me here.”
Some time later，Einstein becomes a
famous scientist. But he still wears the coat.
His friend meets him again and asks him to buy a new one.
But Einstein says，“I needn’t buy a new one。Every-one knows me here.”