All over the world the need for more laptops and computers increases each year. Networks have been part of our life. Probably everyone with a portable device(移动设备）has once logged on to a public WiFi network without paying for it while they are having a coffee, on a train, in a shopping mall or at a hotel. However, is this kind of public WiFi network safe?

Some networks are better protected than others because encryption(加密) methods are used. Therefore, they are safer than others. But a survey in 2015 showed that more than 950 million records were not protected, including addresses, emails, birth dates, phone numbers, passwords and so on. These open WiFi networks are really not safe, because it is very easy for hackers(黑客)to break into the operating system and get people's private information.

Most smartphones and laptops, by themselves, search and connect to WiFi networks. They usually prefer a network with a connection that has been used before. Hackers' devices are able to record these searches and look like the trusted WiFi networks. When these smartphones and laptops log on to the networks which are not real, hackers can easily steal their private information.

So next time, when we want to use our laptops or our smartphones in public places which offer free WiFi networks, please think twice or take safe measures before using them.

NLB Mobile app — a library in your pocket

The National Library Board (NLB) Mobile app is your personal library, anywhere. anytime. By signing in, you will be able to enjoy the full suite of services available to library members such as borrowing items and reading emagazines and enewspapers. But even if you don’t sign in, you can still:

You will need a myLibrary ID. If you do not have it, you may create one online or using the app’s login page — tap on the+ button on the top right of the app’s screen.

You can retrieve (恢复) your myLibrary ID and password:

We are sorry that you are encountering this problem! Here are the steps.

Smartphones have been blamed for everything from taking drivers' attention from driving to keeping people on the sofa scrolling (滚屏) videos. But the smartphone that seems to be everywhere could just as easily increase physical activity if it pushes its owner's buttons in the right way.

New research shows that making social connections through activity-tracking apps gets people to move more. And a separate study on this summer’s “Pokemon Go” phenomenon shows that the smartphone game got players to take thousands more steps than usual. Together, the studies show the potential for smartphones to push a range of people to be more active.

People who linked with friends on the activity-tracking app increase their steps by 400 a day on average over the next week, compared with people who made no social connections, according to Tim Althoff and two other computer scientists at Stanford University. The effect of social connections declined, but remained significant for five months before the numbers fell back even with users who made no connections.

Such insights show the promise of smartphones and games to help with one of the most stubborn public health problems — that even people who want to be active have trouble staying active.

An NBA video game, for example, gives players extra powers in the game if they reach a step goal in real life. The app “Zomies, Run!” uses audio stories to push people to run more or run faster.

Still, there is room for growth: Only about 4% of all health apps use “gamification”, such as point-scoring or competition, according to a study published in October in BMJ Open. “Gamification is actually quite closely linked with behavior change techniques”, says Dr. Elizabeth Ann Edwards, the study's lead author and a doctor and researcher at Queen Mary University of London.