Better think twice before choosing a password for email, online bank or shopping. Simple passwords are easy to be stolen.

    A password is like a key to your home. If someone steals it, he'll get chances to steal something else. We use passwords everywhere in our life. We are so used to passwords that we don't pay any attention to them until we lose or forget one.

    A study of 28，000 passwords recently stolen from a popular website showed that people often do the easy thing. It found that 16% took a first name as a password. Another 14% used the easiest keyboard combinations such as “12345678” or QWERTY. 5% of the stolen passwords were names of television shows or stars popular with young people. 3% of the passwords expressed feelings like “I don't care，” “Whatever，” “I love you，” or their opposite, “I hate you.”

    Robert Graham, who did the study, advises people to choose a password that is longer than eight characters with one capital letter and one symbol.

    Of course, safe passwords don't mean those hard to remember. Forgetting your password is sometimes a big headache for you. Maybe, the perfect password is easy for you and hard for others.

Parents today also worry about their children's diets. Some doctors give the following advice：

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Every single one of us can help to deal with climate change and prepare for the effects.

We all have an effect

on the environment through our use of resources (资源) and burning fossil fuels for everyday activities such as driving cars and heating our homes. If we all do our best to protect our environment, then we can make a real difference.

Consider the environmental effects of:

1       the energy used in your home

2       the way you travel

3       the food you eat

Do everything you can to reduce your carbon footprint (足迹) and not only will you be making fewer effects on the environment, but you511 probably find that you'll also save money and lead a healthier life.

Increasing water efficiency in your home reduces the amount of energy used for water treatment and can save money and fight against climate change at the same time.

Other things you can do

Here's a list of some simple things you can do that will help reduce your carbon footprint:

1       insulate (使隔热) your home

2       turn down your central heating by one degree (度数)

3       use energy efficient lighting

4       try not to fly

5       share a car with others

6       ride your bike for short journeys

7       eat local, seasonal, fresh, unprocessed (未加工的) food

8       reduce the amount of waste you produce and reuse or recycle as much as you can

    Many people are surprised when they find that the Internet was set up in the 1960s. At that time， computers were large and expensive. Computer networks didn't work well. If one computer in the network broke down， then the whole network stopped. So a few network system had to be set up. It should be good enough to be used by many different computers. If part of the network was not working， information could be sent through another part. In this way computer network system would keep on working all the time.

    At first the Internet was only used by the government， but in the early 1970s， universities， hospitals and banks were allowed to use it， too. However， computers were still very expensive and the Internet was difficult to use. By the start of 1990s， computers became cheaper and easier to use. Scientists had also developed software that made "surfing" the Internet easier.

    Today it is easy to get online and it is said that millions of people use the Internet every day. Sending e-mails is more and more popular among young people. The Internet has now become one of the most important parts of people's life.

    The best time to collect green leaves is early in the leafing season but not so early．The months of June and July provide the best leaf samples（样品），but you can find great leaf samples throughout the summer．To make a fall color collection，you have to collect the leaves in autumn．

    I have seen many beautiful fall color collections．

    When you choose leaves for your samples，try to choose leaves of about the same size and shape on the tree．Make sure you collect the entire（完整的） leaves．

    Remember，some leaves have only one blade（叶片） or leaflet（小叶）．Some leaves have a few or many leaflets．You must know these two kinds of leaves．Good leaf collections contain the entire leaves．

    You should dry the collected leaves carefully before putting them in a leaf press（压）．When you collect leaves in the field，you can put them between the pages of book to protect them．And then，press them as soon as possible before you take them from this book．Finally，you should write down each leaf's name and put them in a leaf press．

    What do you usually do on your smartphone? Send text messages, make phone calls or play video games? Now, thanks to a beginner-friendly programming（程序设计） tool, kids can do more than just play games on their smartphones-they can make their own games.

    US high school student Samuel Ndungi spent a few months learning how to make apps（应用软件）for smart-phones.

    "I was really shocked that you could do this on your own," Ndungi said "I thought only people from Microsoft and big companies could do this."

    Ndungi took a class run by his teacher, Michael Braun. In Braun's class, kids learned how to use the beginner-friendly programming tool to program their own mobile apps.

    This tool is called TouchDevelop. It puts basic instructions（基本指令） into blocks of code（代码）, and kids can put them together like Legos to run games, stories and other apps.

    With TouchDevelop, student Tony Huynh learned how to make his own games. "You get to put your own thoughts into the game, like the animals you want, the kinds of backgrounds you would like to see, and so on," he said.

    Another student Shina Williams wrote a program with about 80 lines of code that paints a picture of his childhood Teddy Bear." It's your own creativity, your own mark（印记） of something that's put in there and it stays in there, " she said.

    Coding is more than just a job skill. Children who learn coding also find new ways to think, create and express themselves.