What do you think of the most important inventions in the world? The TV? The printing? The telephone? Or the computer? A report shows that they are not the only important inventions. Here are three other important inventions.

One of the simplest（最简单的）inventions is the toilet（冲水式马桶）. Before toilets, waste ran into rivers from people’s houses. Illnesses were common in big cities, and it was often difficult to find clean drinking water.

Animal food is another important invention. Before the invention, most animals were killed（杀死）every autumn because there was not enough food for them in winter. After hay（干草）became a kind of common animal food, animals could live through the long winter.

The third great invention is glasses. Glasses help people read, write and do “close work” after the age of 45. Without glasses, the world would be difficult for the people above 45.

Today making a phone call is as common as having a glass of water. But when telephones were invented more than 130 years ago, people believed that they were dangerous.

In 1876, when the first telephone was shown to the public, electricity was still new and little understood. Many people had died working with electricity in the early days. That's why most people did not easily accept that it was safe to hear a human voice through the phone.

But on the morning of March 10, 1876, Alexander Bell, and his assistant Thomas Watson, had no such fears. Bell, and Watson had been struggling to make their new invention, the telephone, work. Bell sent his assistant to a room in the basement. In a room upstairs, the telephone inventor spoke seven little words into his invention. These simple words changed the world forever. "Mr. Watson, come here. I want you. "

The telephone was born in March 1876, but it took a few more years for it to gain respect. Bell had to overcome the fears about electricity before people took his invention serious. He also had to convince(使信服) people there was a need for such a machine.

Today, we take telephones in agreement. But on that day in March 1876, there were only two telephones in the whole world. Our world sure has changed, don't you think so?

Jeans are so common, and you may want to know its history and who invented them. Jeans were invented by a German named Levi Strauss. He went to the U.S. in 1847 and followed the Gold Rush to San Francisco. He carried many kinds of fabric（布料）to sell. Levi quickly became a successful businessman. The miners（矿工）in California had a problem with their pants. When they found gold or ore（矿石）, they carried it in their pockets. But the metal was heavy, and the pockets ripped（撕开）. In 1873, Jacob and Levi made the first jeans-tough pants. The miners loved them, and the jeans quickly became popular.

At the beginning, Levi’s jeans were work pants. Many workers wore them all the time. But a gentleman wouldn’t think of wearing jeans. Women didn’t wear pants at all. But this changed when Western movies became popular. All the cowboys were in jeans. People thought the cowboys looked cool. But jeans still weren’t proper（正派的）for places like schools and offices. Back in the U.S., fashions changed. Movie stars wore jeans in their films. Teenagers everywhere loved them. Some schools banned（禁止）jeans because of their “rebel”（叛逆）image. But casual clothing, including jeans, became popular for more and more occasions. Eventually, jeans were so common that it became okay for anyone to wear them. You can even find pictures of the president wearing jeans.

Today, all kinds of people around the world wear jeans. People wear them everywhere. Jeans are popular today for the same reasons they were popular when Levi Strauss first made them. They look good, they last long, and they are comfortable. That’s probably why you own a pair or two, or seven, yourself.