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 persuaded 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 met 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 persuade once more him to buy a new overcoat?