Online shopping has become very popular in recent years. It’s a brand new way for shopping, and at the same time, it saves money because items sold online are much cheaper. Therefore, customers from different countries are changing their ways of shopping. As for some wise men, they find another way to save much more money-using online coupons（优惠券）to shop. Online coupons enable them to get the items they want to buy much cheaper.

As we all know, sometimes manufacturers, shops, restaurants and entertainment clubs will provide special offers. For example, a shirt asks for $100, but if a coupon is used, the customers may get the shirt at $90. Sometimes, by using a coupon, one can luckily get a free product. Online coupons work in the same way; online shoppers get discounts by using online coupons.

In this case, you are advised to do some research to make sure whether there is a coupon or vouchers（代币券）concerned with the items you want to buy online. Then comes the point where to find online coupons. Usually there are three ways:

1. Find the official websites of the brands. To promote sales, some brands will offer online coupons on their own websites.

2. Visit the special coupon websites. There are special websites where coupons from many shops, restaurants and so on are gathered. Buyers input（输入）keys of coupons they are fond of, and thousands of related coupons in different cities in America will be listed. To narrow down your list, just click the district you are located in.

3. Pay attention to some social websites. To let more people know coupon information, some shops will show their information on social websites where a lot of online buyers visit.

Because information on the Internet often cannot be cleaned in time, much invalid information will be searched out. So when you find a proper coupon, please don’t get carried away. Read the information carefully, ensuring that they have not expired（失效）yet. If interested, you can visit Couponeed. com to find coupons and save money.

   Government intelligence agencies have a plan to build computers that store information inside DNA and other organic molecules（分子）.

Intelligence Advanced Research Projects Activity（IARPA）announced plans to develop tabletop-sized machines that can store and retrieve（取回）data from large batches of polymers — a term that refers to a wide variety of long，string-like molecules. Polymers can store data in individual atoms or groups of atoms.

The project is an attempt to solve a basic problem of the modern era:the vast and growing costs of data storage. Datacenters around the world sucked up 416. 2 terawatt hours of electricity in 2016. That's about 3 percent of the global supply，and it accounts for 2 percent of global greenhouse gas emissions.

A 2016 paper found that DNA，in particular，could store computer information more densely，require less energy，and survive higher and lower temperatures than conventional hard drives. The authors of that paper reported on the successes of prototype（雏形）DNA computers that used the genetic molecules for both long-term storage and random access memory（RAM）.

But no one has yet figured out how to handle DNA data storage on large scales.

IARPA officials said the new effort, called Molecular Information Storage, will be broken up into three periods:a two-year program to figure out how to store data in DNA or other molecules at high speed,a two-year program to figure out how to retrieve that data at high speed, and a two-year effort to develop an operating system that can run on that DNA.

Many of the technologies IARPA wants to develop are untested at these scales, so it's unclear how far away that proposed tabletop device really is.

   Perhaps you have heard a lot about the Internet, but what is it, do you know? The Internet is a network. It uses the telephone to join millions of computers together around the world.

Maybe that doesn’t sound very interesting. But when you’re connected (连接) to the Internet, there are a lot of things you can do. You can send e-mails to your friends, and they can get them in a few seconds. You can communicate with your friends through social software such as QQ, WeChat, and Facebook. You can also do with all kinds of information on the World Wide Web (WWW) .

There are many different types of computers now. They all can be linked to the Internet. Most of them are small machines sitting on people’s desks at home, but there are still many others in schools, offices or large companies. These computers are owned by people or companies, but no one really owns the Internet itself.

There are lots of places for you to surf the Internet. For example, your school may have the Internet. You can explore the Internet to search for useful information or knowledge in your classroom. However, in order to prevent yourself from playing with computer games, you should use it in limited time. Libraries often have computers joined to the Internet. You are welcome to use it at any time.

Thanks to the Internet, the world is becoming smaller and smaller. It is possible for you to work at home with a computer in front, receiving and sending the information you need. You can buy or sell whatever you want through the Internet. But do you know 98% of the information on the Internet is in English? So what will English be like tomorrow?

   A lot of people say math is not their strong suit. One New Jersey parent wants to help change that. Laura Overdeck grew up with numbers. She always helped measure ingredients（食材）when her mother baked，and she learned about angles from her father. She went on to major in astrophysics（天体物理学）in college. Overdeck wanted her own children to be good at math，too.“And when our first child was about two，we just started giving her a math problem every night，”Overdeck said. The problem was usually a story，involving animals，cars or candies that let the kid count.“Our third child started，at age two，yelling that he wanted his own math problem because he saw his brother and sister doing it. And we thought，‘Wow，we have a household where math is the popular thing at bedtime，’”Overdeck said.

In February，Overdeck set up Bedtime Math，an Internet website where she posts daily puzzles for children. Overdeck is particularly keen to hook（吸引）children on numbers before they go to school. So why introduce little ones to math so early？

Sian Beilock，an expert on performance anxiety，says the more fun and familiar math is early on，the less likely children will feel nervous when they start to learn math in school.“My lab has shown recently that kids as early as first grade report feeling anxious about doing math，”Beilock said.

“You can hear totally educated adults say，‘You know I’m just not that good at math.’or‘I’m kind of afraid of math.’And that’s a totally acceptable thing for a well-educated person to say，but you never hear them say，‘Well，you know，I’m just not that good at reading.’，”Overdeck said. She wants children and their parents to become as fluent in numbers as they are in Harry Potter.

Anvitha Vijay，who is only nine years old，has built two educational apps. One is Smartkins Animals，which helps many 【小题1】（child）identify more than 100 animals and 【小题2】 other is Rainbow Colors，which teaches kids colors.

With the help of YouTube videos，the young girl from Melbourne，Australia，learned codes（编码）at age 7 all by 【小题3】（she）. Soon，she was trying her hand at making apps.“When I first got my iPad，I 【小题4】（attract）immediately by all the apps on it，”she told TFK.“It wasn't long 【小题5】 I wanted to create my own.”

Anvitha's skills won her a scholarship to attend a big tech conference hosted by Apple in San Francisco，California. There，she got tips from the professionals and went to workshops 【小题6】 she learned about the latest software for app building. All that training led to an idea for a third app. This one，called GoalsHi，inspires kids 【小题7】（develop）good habits.

Anvitha's goal is to keep on 【小题8】 (create) technology that helps kids learn while they are having fun. But what's even more 【小题9】 (importance) to her is that the world sees the power of technology in kids' hands.“The more training we get in tech at an early age,”she says,“the 【小题10】 (good) chance we will have of becoming champions who will one day change the world.”