Teenagers are known for being creative and full of new ideas. Let’s have a look at these teenage inventions that might change the world.

Banana leaves usually go bad in two or three days. Tenth Hadith, a teenager from India, used UV to make the leaves stay fresh for a year. Tenth thinks that one day the leaves will be used for making plates, cups and other things.	David Cohen, an American teenager, built an earthworm robot. It is able to go into even the smallest places, where humans or dogs can’t go. It will be used for finding people in a fire or an earthquake.
Remya Jose, a 14-year-old from India, found it tiring and boring to hand wash clothes in the nearby river. She reused some bicycle parts and created a washing machine that saves time, energy and keeps people fit at the same time.	Kenneth Shinozuku, a 15-year-old from New York, noticed that his grandfather who got Alzheimer’s disease would leave home and often get lost. So he invented the wearable sensors（感应器）to help people find their family members like his grandfather.

What will our homes be like in the future? Here are some predictions:

◆You will go to the kitchen when you are hungry. But you don’t have to do anything except give orders to the kitchen robot. The robot will cook the food for you in a few minutes. Then it will bring it to you.

◆Did I turn off the oven? Did I close the window? Everyone may have a moment like that. But in the future, your home will check these for you.

◆In your home of the future, all of your devices (设备) can work together to make your life more convenient (方便的). When you turn on the lights in the morning, your windows will open at the same time. The lights will slowly turn off by themselves after the sun appears.

Your home may have dangers. The hackers (黑客) could open your door and make your room messy through your phone or other devices. Your home will tell you about it but you can’t arrive in time. So people will have to be careful about their personal information.

Paper is one of the most important products ever invented by man. The invention of paper meant that more people could be educated because more books could be printed. Paper provided an important way to spread information.

According to Chinese written historical records, paper was made in about AD 105 by Cai Lun, an official during the Han Dynasty. He took the inner bark of a tree and bamboo, mixed them with water, and pounded them with a wooden tool. He then put this mixture onto a piece of cloth and let the water through, leaving only the fibers (纤维) on the cloth. After it dried, Cai Lun discovered that he had created a good writing thing—paper. It was easy to make and take.

Chinese papermaking was introduced to Korea and Vietnam and later to Japan at the beginning of the 3rd century. It was a valued export (出口) in Silk Road trading, but the papermaking process was kept secret.

During the Tang Dynasty and the Song Dynasty, different kinds of paper were developed including bamboo paper and xuan paper.

By the end of the 7th century, the papermaking process reached India, Nepal, Pakistan and Bangladesh. In about AD 751 after an important war, the secret of papermaking was gotten from two Chinese prisoners (囚犯) caught by the enemies. The invention was then spread to Europe.

After many years, the invention had been spread all over the world and people thought it was one of the most important inventions. Today, both paper and paper money are used in all corners.