When we think of paper, we think of newspapers and books. But there are many other uses. Only half of the world’s paper is used for books and newspapers.

Paper is very good for keeping you warm. You have perhaps seen homeless men asleep on a large number of newspapers. In Finland, it is sometimes -40℃ in winter. The farmers wear paper boots（靴子）in the snow. Nothing could be warmer.

Each year, more and more things are made of paper. We have had paper cups and plates for a long time. But now we hear that chairs, tables, and even beds can be made of paper. With paper boots and shoes, you can wear paper hats, paper dresses, and paper raincoats. When you have used them once, you throw them away and buy new ones.

The latest use of paper seems to be paper houses. These are not small houses for children to play in, but real, big houses for people to live in. You can buy a house with three rooms for about 500 dollars. You can put it up by yourself in a few hours, and you can use it for about five years.

Stonehenge, a rock circle, is not only one of Britain’s most famous historical places but also one of its greatest mysteries.     17     People like to go to this place especially in June as they want to see the sun rising on the longest day of the year.

For many years, historians believed Stonehenge was a temple where ancient leaders tried to communicate with the gods. However, historian Paul Stoker thinks this can’t be true because Stonehenge was built so many centuries ago.     18    

Another popular idea is that Stonehenge might be a kind of calendar. The large stones were put together in a certain way. On midsummer’s morning, the sun shines directly into the center of the stones. Other people believe the stones have a medical purpose.     19     “As you walk there, you can feel the energy from your feet move up your body,” said one visitor. No one is sure what Stonehenge was used for, but most agree that the position of the stones must be for a special purpose. Some think it might be a burial place or a place to honor ancestors. Others think it was built to celebrate a victory over an enemy.

    20     Most historians believe it must be almost 5,000 years old. One of the greatest mysteries is how it was built because the stones are so big and heavy. In 2001, a group of English volunteers tried to build another Stonehenge, but they couldn’t. “We don’t really know who built Stonehenge,” says Paul Stoker. “And perhaps we might never know, but we do know they must have been hard-working and great planners!”