原文：
Before Einstein, scientists believed
that light traveled through space in a straight line. But Einstein
was able to prove that light coming from the stars was bent as it
passed the sun.
As a result, it appeared to scientists on earth that the stars had
moved.
He worked out just how much the light would be bent; he could also
work out how far the stars would appear to have moved.
His discovery was completely new; it was said that only three people
in the world could understand it at that time. The difficulty was
how he could prove his ideas to other scientists. Many
of them did not accept his scientific ideas. But Einstein stuck to
his opinion and went on with his research.
By 1919, scientists who had been watching the stars supported his
work and he quickly because world-famous. From that time on Einstein
was greatly respected as the leading scientist of the century.
The first World War (1914-1918) had brought him great sadness.
He had taken Swiss nationality in 1901 and therefore did not have
to join the army, as Switzerland did not take sides in the war.
However, he thought that the war was a terrible thing. All through
his life he believed that fighting and killing in wars was wrong.
What he wanted to see was an end to all the armies of the world.
When Germany was ruled by Hitler in the early 1930s, Einstein,
who was a Jew, found it impossible to continue living in Germany.
His friends were beaten, or taken away, or their homes were destroyed.
While he was in America, Einstein wrote a letter to a newspaper to
say that these acts were wrong. It meant that he would never be able
to visit Germany again. That is why Einstein and his family left Europe
for the USA in 1933.
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