It's every parent's worst nightmare there's a fire in the house, the alarms are beeping, but the children are sleeping on. Now scientists have found a better way to rouse slumbering youngsters. Researchers in the US have discovered that playing a child a recording of his mother's voice is about three times more likely to wake him up than a traditional alarm.

    Writing in the Journal of Pediatrics, Smith and colleagues report how they compared the effects of four different smoke alarms on 176 children aged between 5 and 12 years old, none of whom had hearing difficulties or were taking any medication that affected their sleep. While one alarm featured a high-pitched beep the sort of commonly found in households the other three featured the voice of the child's mother calling either the child's name, giving instructions such as: "Wake up! Leave the room! ", or both. Each child slept in a lab-based room that resembled a real bedroom.

    The results show that vocal alarms appear to be more effective than high-pitched beeps. About 90% of children woke for a voice alarm compared with just over 53% for the traditional alarm.

    “High pitched beeping alarms don't wake up children well at all under about 12 years of age, "said Dr Gary Smith, a co-author of the research from the Nationwide Children's hospital in Ohio, although

he said at present it is not known why. He said it was important to look at developing better alarms.

    Prof Niamh Nic Daeid, director of the Leverhulme Research Centre for Forensic Science at the University of Dundee, said the research found a human voice combined with a low-frequency pulsing tone was far more effective in waking up children than a traditional high-pitched alarm. She also noted that more work was needed to explore whether other familiar sounds, such as a dog barking, might also prove effective in rousing children.

How honey is made

"Do you know Macao was never my real name? I have been away from you for too long, mother..."

Song of the Seven Sons-Macao, written by Wen Yiduo in 1925, is still in the hearts of Macao's teenagers today. The Basic Law of Macao Special Administrative Region (《中华人民共和国澳门特别行政区基本法》) came out in 1993 and started to work on Dec. 20, 1999, as Macao returned to China. From then on, it has become much easier for young people to build a closer relationship with their motherland.

Chan U, an 18-year-old, is studying at the University of Macao. She said "Traveling to the Chinese mainland (大陆) has become easier. Visits to Zhuhai have become a part of the daily life of some people." Kun Lot U, 25, studies at the South China University of Technology. She said "Many local people go to Zhuhai to buy vegetables as they are fresher and cheaper than those in local markets. Young people often go to Zhuhai to play jubensha, a role-playing game."

The number of trips out of Macao in January was 2.23 million, and most of them went to the Chinese mainland. Cities like Chongqing, Changsha and Hangzhou are popular places for young people, according to Chan. Guangdong is also a good choice since the language and food are similar.

"Young people in Macao care a lot about what's happening on the mainland," said Kun. Like the young people on the mainland. they also use apps from the mainland to know the hot issues(话题). They have learned many mainland Internet catcbphrases (流行语). "1know about the most popular ones such as ‘yyds'," said Kun. "They make us understand more about people and life on the mainland."

More than half of the people in Macao use online shopping apps from the mainland.Kun said that it's because they can find almost everything they need at good prices on the apps. The products are first shipped to a collection station in Macao. It usually takes about three to seven days for local people to get the products. "The connection between Macao and the motherland is getting stronger and stronger," said Chan.

A library is a very good place. Nearly every place has a library, like a city, a town, a school, even a small village. Libraries are here and there in the world.

 Our school has a library. It's not big but clean and tidy. There are different kinds of books, magazines, dictionaries and CDs in it. The chairs and desks are nice and the teachers are friendly to students. All the students in our school enjoy reading in the library. There are four small reading rooms in the library. There is also a big one. Every room has many books. Some are in Chinese, and others are in English. We can read and do our homework there. We often read with the help of our teachers because some books are too difficult for us. My classmates and I are getting ready to read now. Reading books helps us a lot.

 You see, a library is always     ▲     because it can open our eyes to the outside world.

I Imagine that you have woken up on the first day of your vacation. You enjoy a delicious breakfast, take a walk on the beach, and read the morning newspaper as you drink coffee. You are feeling happy and relaxed. But you may start to feel bored by the time the late afternoon comes around!

If you have ever felt like this, you' re not alone. It turns out that having unlimited(无限的) time is not always as great as we expected. What is the best amount(数量) of free time for our happiness?

 Researchers tried to answer this question by surveying tens of thousands of people, collecting data(数据) on how they spent their time and how happy they were. After looking at the data, the research team found that having less than two hours of free time a day was not enough to be happy. People with under two hours of free time a day usually had more stress. It means that they were simply too busy with work to get their happiness.

 The fact that being too busy cuts happiness is true. It might lead to the answer that more free time is simply better. Surprisingly, having a lot of free time is not a panacea(灵丹妙药) for happiness. People surely get a certain sense of joy from finishing tasks. Having more than five hours of free time a day makes us lose the sense of joy. It is in fact cutting our happiness. But I think it is how we spend our free time that makes a difference. When free time is used in more active ways, like playing a team sport, then five or more hours a day can keep or even produce happiness. However, spending five or more hours of free time alone can stop happiness.