Before the invention of hair dryer,vacuum cleaners were being used for the purpose of drying and styling hair. The early vacuum cleaners could draw in air as well as blowing air.So,towards the end of the 19^th century,women used to dry their hair by using a vacuum cleaner.

    In 1890,a French salon owner Alexander F.Godefroy invented the first hair dryer.It blew warm air.However,it was not widely used,mainly because of its large size.

    The first convenient hand-held hair dryer used at home came up in 1920.It weighed over 2 lbs.However,it only produced 100 watts of power,which was not enough to dry the hair.After almost ten years came the gas-heated dryers that were widely used in barber shops.However,these dryers produced heat that was harmful to hair and the air from them made people sick,so they were soon gone.

    Around the 1940s and 1950s,the helmet（头盔）style electric dryers came into being.Curly hairstyles were popular during that time.Therefore,women used curlers and sat under the dryers to set their curls.Later,the curly style began to drop,and so did the popularity of the helmet style electric dryer.

    In the late 1950s,the first workable hair dryer was made.It had a hand-held dryer.It used only 300-400 watts. Ever since the 1950s,hand-held dryers have experienced many changes,in order to become quieter,lighter and smaller.However,how it works largely remains the same.The modem technology has made improvements to the hair dryer,reducing the heat damage to a person's hair.For producing shinier,smoother and healthier hair,dryers have been included with negative ion（负离子）technology that dries hair faster and with less heat.

    New research suggests that there are only four basic facial expressions of emotion. However, how these expressions are understood might depend on where you are from.

    Research by scientists from the University of Glasgow in the UK has challenged the traditional view of how the face expresses emotions. Many scientists had believed that there were six basic emotions that people from all cultures recognized. These were happiness, sadness, fear, anger, surprise and disgust(厌恶). However, the University of Glasgow's work now suggests that the human face only had four basic expressions of emotions. This is because some pairs of emotions are impossible to tell apart, especially when they are first shown on the face. Fear and surprise, both share wide-open eyes. The facial expressions for anger and disgust also look the same.

    So if our faces are only able to express four basic emotions, how do we communicate much more complex feelings? The study found that the way expressions are understood is different in different cultures. Lead researcher Rachael Jack was studying this because “facial expressions were considered to be universal”, she explained. However, while looking at how people from the East and West recognize different parts of the face, they found that although there are some common features across cultures, the six basic facial expressions of emotion are not recognized universally.

    “We said we don't know what a disgust face looks like in China, so the best way to go about that is to make all combinations of facial movements and show the Chinese people and ask them to choose the ones they think are disgust faces.” With the software they developed, they discovered that in the early stages of signaling emotion, fear and surprise, and anger and disgust, were often confused. Jack explained that this development of facial expressions is related to biology and social situations.

    What has caught people's interest is the cross-cultural aspect of the work. “This study shows which emotions we share, and which are different in different cultures,” Jack said. This finding could help us develop new communication technologies, for example ones that use video-calling programs like Skype. When you talk to someone in Japan in the future, a programme could “read” your facial expressions and then “translate” them for the Japanese person. The Japanese person would see the Japanese facial expression on their screen. In this way, people from different cultures could understand each other better.

    Everyone should be so lucky as to have a friend like Francia Raisa. On Thursday, singer and actress Selena Gomez, 25, used Instagram to explain why she was “laying low” this summer. She posted a photo of herself in a hospital bed with her friend Francia Raisa holding hands. She said she recently received a kidney transplant from her best friend because of complications（并发症）from lupus（狼疮）, an autoimmune disease, which means it is the result of the immune system attacking normal tissue, including the kidneys, brain, heart and lungs.

    People with lupus may first experience tiredness, joint pain or a little bit of rash（皮疹）on their bodies and can go for a long time before their doctors realize it is more serious. Many people see two or four doctors before the real problem is picked up. According to Dr. Kyriakos Kirou, roughly a third to one-half of people with lupus develop kidney disease, and up to one in five of them will eventually need a transplant, sometimes because they weren't treated with effective drugs to prevent the immune system from attacking the kidneys. Though Gomez said that she was “very well now,” she warned about the dangers of not taking medical diagnoses seriously, like she initially did.

    Her Instagram post also called attention to two major health topics: the need for living organ donators and the fact that Gomez represents three groups more likely to be diagnosed with lupus and lupus-related kidney disease. Nine out of 10 people diagnosed with lupus are women, and most develop the disease between the ages of 15 to 44. And lupus is two to three times more common among women of color, including Hispanic women, according to the Lupus Foundation.

    Raisa is Latina, and Gomez's father is of Mexican origin. While it's not essential that the organ donator and receiver be of the sane ethnicity, people who share a similar background sometimes are better matched, according to data from the United Network for Organ Sharing.

    Passenger Information

    Carry-on Bag Rules

    When travelling on China Southern planes, we ask our customers to follow our simple bag rules.

—Each passenger is allowed to bring one bag onto the plane.

—Weight limit: Each carry-on bag may weigh up to 10 kilos.

—Size limit: Each carry-on bag can be up to 110cm long, 60cm high and 30cm wide.

—Additional bags and oversized/overweight bags may be allowed on the plane if there is enough room. There will be a fee for such bags (see the table below). Please note that if your bag breaks more than one rule then you must pay a fee for each rule broken.

    Safety Rules

    For the safety of our passengers, the following items must not be taken onto the plane:

—Bottles containing gas (e.g. cigarette lighter)

—Bottles containing any cream, oil or other liquid that are over 100ml.

    Note:

    If you have any liquid medicines over 100ml that you must use during your flight, please contact our customer service manager on 34533566 to make arrangements at least 24 hours before your departure. You will need to have a doctor's letter explaining why you need the medicine.

    Bag Fees

    No bag over 15 kilos will be allowed on the plane. **No bag over 150cm long or 80cm high may be taken on the plane. Passengers must put such bags in the plane's storage.

    On Saturday evening, CCTV showed a computer-generated image of the Chang'e 3 lander's path as it approached the surface of the moon, saying that during the landing period it needed to have no contact with Earth. As it was just hundreds of meters away the lander's camera broadcast images of the moon's surface.

    The Chang'e 3's solar panels, which are used to absorb sunlight to generate power, opened soon after the landing. The mission blasted off (发射) from southwest China on Dec. 2 on a Long March-3B carrier rocket. It is named after a mythical Chinese goddess of the moon and the “Yutu” rover vehicle, or “Jade Rabbit” in English, afternoon the goddess' pet.

    China's military-backed space program has made much progress in a relatively short time, although it is behind the United States and Russia in technology and experience. China sent its first astronaut into space in 2003, becoming the third nation after Russia and the United States to achieve manned space travel independently. In 2006, it sent its first probe (探测器) to the moon. China plans to open a space station around 2020 and send an astronaut to the moon after that.

    “They are taking their time with getting to know about how to fly humans into space, how to build space stations, how to explore the solar system, especially the moon and Mars. They are making big advancements, and I think over the next 10-20 years they'll certainly be matching Russia and America in this area and maybe overtaking them in some areas.”

    Only about 30 percent of people in the US know how to perform CPR (心肺复苏术). Recently, a 9-year-old boy showed a Georgia woman how to perform CPR on her newborn baby.

    Susanna Rohm said she had experienced a parent's worst nightmare (噩梦) — her 2-month-old son, Isiah, was not breathing. "I noticed he looked pale. I looked at his arms and his legs and they were limp (无力的)," Rohm told a local newspaper. "Then I noticed that he looked like he wasn't alive." Indismay, she dropped and broke her cellphone. Rohm had to run into the street, screaming for help.

    "I had him in my arms and screamed over and over. Then I ran outside. I saw two boys playing across the street, and I yelled, 'Go and ask your parents to call 911,'" Rohm said. But the two boys were able to do more than that. Nine-year-old Ethan Wilson took action, showing Rohm how to perform CPR on little Isiah while ten-year-old Rocky Hurt helped as well.

    Rocky said he had learned the CPR technique from a poster in a health class at their school, Sedalia Park Elementary. "I was thinking we'd better give her a helping hand instead of getting scared," Ethan said. "I told her to push on the baby's chest five to ten times a minute with only two fingers, tilt back the baby's head, plug the baby's nose and breathe into the baby's mouth," Ethan said in an interview.

    At last, Isiah began crying and was breathing again. He spent two nights in a local hospital. "If the little boy hadn't shown me what to do right there, my baby would probably not be alive right now," Rohm said.