Most people around the world are right-handed. This also seems to be true in history. In 1799, scientists studied works of art made at different times from 1,500 B.C. to the 1950s. Most of the people shown in these works are right-handed, so the scientists guessed that right-handedness has always been common through history. Today, only about 10% to 15% of the world's population is left-handed.

Why are there more right-handed people than left-handed ones? Scientists now know that a person's two hands each have their own jobs. For most people, the left hand is used to find things or hold things. The right hand is used to work with things. This is because of the different work of the two sides of the brain. The right side of the brain, which makes a person's hands and eyes work together, controls the left hand. The left side of the brain, which controls the right hand, is the centre for thinking and doing problems. These findings show that more artists should be left-handed, and studies have found that left-handedness is twice as common among artists as among people in other jobs.

No one really knows what makes a person become right-handed instead of left-handed. Scientists have found that almost 40% of the people become left-handed because their main brain is damaged when they are born. However, this doesn't happen to everyone, so scientists guess there must be another reason why people become left-handed. One idea is that people usually get right-handed from their parents. If a person does not receive the gene (基因) for right-handedness, he / she may become either right-handed or left-handed according to the chance and the people they work or live with.

Though right-handedness is more common than left-handedness, people no longer think left-handed people are strange or unusual. A long time ago, left-handed children were made to use their right hands like other children, but today they don't have to.

The singer and actress Eartha Kitt was born into a poor family in South Carolina in1927. When Eartha was eight, her stepfather（继父）didn't want Eartha to live with them. She was sent to New York City to live with an aunt. The relationship was difficult. The aunt helped pay for piano and dance lessons for Eartha. But she also treated the girl badly.

Eartha lived on the streets and worked in a factory as a young teenager. But she kept up her dance lessons. One day, she decided to try out for a famous African-American dance company called the Katherine Dunham Company. Soon, Eartha was performing in shows around the world with the company.

In Paris, Eartha left the dance company to sing in a nightclub. Her voice was unusual. People there liked her singing. She learned French quickly and had many French fans.

The film director Orson Welles discovered Eartha singing in Paris. He called her "the most exciting woman in the world". Welles asked her to play a lead part in a play that he was directing（执导）and also playing a part in. Later, Eartha returned to NewYork and appeared in the Broadway show New Faces of 1952. A humorous song she sang about a bored, spoiled woman became famous. Eartha appeared in the 1957 movie The Mark of the Hawk. She was very careful about choosing her roles in films. Her other films in the 1950s included St. Louis Blues and Anna Lucasta. Throughout the rest of the 1950s and early 1960s, Kitt recorded, worked in films, television, and nightclubs, and returned to the Broadway stage. In 1964, Kitt helped open the Circle Star Theater in San Carlos, California. In the late 1960s, she played "Catwoman" in the television series Batman. This role made her really famous.

Welcome to Pingshan Culture Square

Shanghai, China's largest modern city, lies in the middle of China's east coastal line. It has an area of 6, 340 square kilometers. There are about 25, 000, 000 people in Shanghai. It is a very modern city and there's very convenient public transportation. We can travel around by bus, subway, light rail and so on. Besides, there are two big international airports. 

It is an open city along the coast, as well as a famous historical and cultural city. Shanghai's history and culture attract tourists home and abroad, being regarded as "Paris of China". There are also many places of interest in Shanghai, such as the Disneyland, the Oriental Pearl Tower, Jinmao Building, the Science and Technology Museum and Yu Garden. 

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