Ten-year-old Barack Obama was one of the only three black students at his school in Hawaii, US. He felt very different from most other students. White girls wanted to touch his hair. ①A white boy asked him whether his father ate people.“I lied (说谎) to them that my father was a Kenyan prince. But I kept asking myself who I am," said Obama. However, 37 years later, the boy made history—Obama became the first black president in the history of the US.

    Obama was born in 1961, to an African father and a white American woman in a small town in the US. He grew up in Indonesia and Hawaii. ②This unusual background made him want to know who he was. He once drank much wine to help forget this question.

    With the help of his friends, Obama finally went to college. His hard work made him a star at Harvard. Later, he became the third black senator (参议员) in the history of the US. During his race to the highest post in the US. Obama talked about his background. He called for a United America, rather than a white America or a black America.

    Obama's success has made Martin Luther King's dream come true. That is: A man should not be judged by the color of his skin, but by the content of his character.

    How much do you know about Albert Einstein?

    Albert Einstein, born on March 14, 1879 in Germany, was a great scientist in the world. ①He was strange because he hated haircuts and new clothes. He believed in peace. All his life, he hated war. However, his most famous idea, E = mc², helped create the world's most dangerous weapon (武器). Many people think he was the smartest person in the world. But Einstein said that he thought like a child with many questions and unusual ideas.

    What did he like?

    Einstein liked learning sailing (帆船运动). He sailed in small boats all his life. He once joked, “Sailing is the sport that takes the least energy!” When Einstein was a child, his mother made him take violin lessons. At first, he didn't like the violin. But then he learned to love music and became a good violinist.

    Later, he said, “②热爱是最好的老师。”

    Why is the sky blue?

    In 1910, Einstein asked a question which many children often ask, “Why is the sky blue?” After his careful research, he answered the question like this: “It's because light is made up of many colors including blue. When light travels to Earth, gas particles (气体微粒) spread the blue light all over the sky.” His answer is true in physics.