Here is a story to show how naive( 天真的 ) Einstein was on occasion. Shortly after he moved to America, he was inveigled (诱骗) into giving an address before a group of mathematicians at Princeton University. It took some time, for , with characteristics shy and quiet, he said he had nothing to say that the audience wouldn't already know. At last he agreed to talk on some aspects of tensor analysis (结量分析). A small card, announcing the speaker, time,and place, was put up on the notice board of Fine Hall, where the address was to be given.
When the day for the address arrived, Princeton University campus was filled with cars, reminding people of the Princeton vs Yale football game, and great crowds of people were walking around Fine Hall, trying to get into the small hall there, It turned out that the little card posted in Fine Hall, and intended only for the interested mathematicians, was read by some students. These informed other students. Students wrote home to parents,and the parents came, picking up friends on the way. The people of Prin-ceton also arrived. Everyone wanted to hear the great man speak.
Einstein was led through the shoving crowd and placed in a seat in the front row of the little hall, to wait for introduction at the proper moment, Turning his head and looking about in surprise at the excited and pushing crowd trying to get into the hall he said to himself, "I never realized that in America there was so much interest in tensor analysis.
