One day the famous American scientist Albert Einstein met an old friend of his on a street in New York．
“Mr.Einstein．”said the friend．“it seems that you need to put on a new overcoat．Look，how worn-out it is！”
“It doesn’t matter．”answered Albert Einstein．“No one knows me here in New York．”
Several years later they met in New York again．Einstein had been a world-famous physicist after then but he still wore the same old overcoat．
Once more his friend advised him to buy a new one．
“There is no need now，”said Einstein．“Everybody here has known me．”
根据短文内容，回答问题。
Where did Albert Einstein meet an old friend of his？
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What did the friend want him to buy？
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How about Einstein’s overcoat？
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Did Einstein still wear the same old overcoat when he became a world-famous physicist？
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What did Einstein say when the friend advised once more him to buy a new overcoat？
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