最新中学生百科英语2

中学生百科英语2:Thoughts & Notions

01 The Zipper 02 The Postage Stamp 03 Pencils and Pens 04 The Umbrella 05 The Metric System 06 Thai Boxing 07 Sumo Wrestling 08 Tarahumara Foot Races 09 Olympic Sports 10 Great athletes 11 The Puffer Fish

12 Foods from Around the World 13 Chocolate

14 The Blue Revolution

15 Twenty-One Days Without Food 16 The Marie Celeste 17 The Roanoke Settlement 18 The Easter Island Statues 19 The Tunguska Fireball 20 Mystery of the Monarchs 21 The History of Money 22 Mass Marketing 23 Inflation

24 Doing Business Around the World 25 Credit Cards

1 The Zipper

The zipper is a wonderful invention. How did people ever live without zippers?

They are very common, so we forget that they are wonderful. They are very strong, but they open and close very easily. They come in many colors and sizes.

In the 1890s, people in the United States wore high shoes with a long row of buttons. Clothes often had rows of buttons, too. People wished that clothes were easier to put on and take off.

Whitcomb L. Judson, an engineer from the United States, invented the zipper in 1893. However, his zippers didn't stay closed very well. This was embarrassing, and people didn't buy many of them. Then Dr. Gideon Sundback from Sweden solved this problem. His zipper stayed closed.

A zipper has three parts: 1. There are dozens of metal or plastic hooks (called teeth) in two rows. 2. These hooks are fastened to two strips of cloth. The cloth strips are flexible. They bend easily. 3. A fastener slides along and joins the hooks together.

When it slides the other way, it takes the hooks apart.

Dr. Sundback put the hooks on strips of cloth. The cloth holds all the hooks in place. They don't come apart very easily. This solved the problem of the first zippers.

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2 The Postage Stamp

Before the invention of the postage stamp, it was difficult to send a letter to another country. The sender paid for the letter to travel in his or her own country.

Then the person in the other country paid for the rest of the trip. If a letter crossed several countries, the problem was worse.

Rowland Hill, a British teacher, had the idea of a postage stamp with glue on the back. The British post office made the first stamps in 1840. They were the Penny Black and the Twopence Blue. A person bought a stamp and put it on a letter. The post office delivered the letter. When people received letters, they didn't have to pay anything. The postage was prepaid.

Postage stamps became popular in Great Britain immediately. Other countries started making their own postage stamps very quickly.

There were still problems with international mail. Some countries did not want to accept letters with stamps from other countries. Finally, in 1874, a German organized the Universal Postal Union (UPU). Each country in the UPU agreed to accept letters with prepaid postage from the other members. Today, the offices of the UPU are in Switzerland. Almost every country in the world is a member of this organization. It takes care of any international mail problems. Today, post offices in every country sell beautiful stamps. Collecting stamps is one of the most popular hobbies in the world, and every stamp collector knows about the Penny Black and the Twopence Blue.

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