In the traffic lights,red means "stop",green means "go",and yellow means "hurry": Why those colors, though? Why not blue,purple,and brown?The following are transponded from others WeChat.

●Red is an inherited symbol from railroads

    Red symbolizes danger in many cultures,which makes sense,considering it has the longest wavelength of any color,meaning you can see it from a greater distance than other colors.Red has meant "stop" since long before cars existed,with railway signals use of red dating bake to the days when mechanical arms lifted and lowered to indicate whether the rail ahead was clear.So that one's simple.

●Green meant "caution" at first

    Green's role in lights has actually changed dramatically over time.Its wavelength is next to (and shorter than) yellow's,meaning it's still easier to see than any color other than red and yellow.Back in the early days of railway lights,green originally meant "caution",while the "all-clear" light was,well,clear or white.Trains,of,course,take an unlimitedly long time to stop,and legend has it that several disastrous collisions happened after an engineer mistook stars in the night horizon for an all-clear.Thus,green became "go",and for a long time,railways used only green and red to signal trains.

●Yellow means "caution" because it's almost as easy to see as red

    From the earliest days of motoring up until the mid-1900s,not all stop signs were red-many were yellow, because at night it was all but impossible to see a red stop sign in a poorly lit area.The yellow stop-sign craze began in Detroit in 1915,a city that five years later installed its first electric traffic signal,which happened to include the very first amber traffic light,at the corner of Michigan and Woodward Aves.

    People who have lost the ability to understand or use words due to brain damage are called aphasics（失语症患者）.Such patients can be extremely good at something else.From the changing expressions on speakers' faces and the tones of their voices,they can tell lies from truths.

    Doctors studying the human brain have given a number of examples of this amazing power of aphasics.Some have even compared this power to that of a dog with an ability to find out the drugs hidden in the baggage.

    Recently,scientists carried out tests to see if all that was said about aphasics was true.They studied a mixed group of people.Some were normal;others were aphasics.It was proved that the aphasics were far ahead of the normal people in recognizing false speeches—in most cases,the normal people were fooled by words,but the aphasics were not.

    Some years ago,Dr.Oliver Sacks wrote in his book about his experiences with aphasics.He mentioned a particular case in a hospital.Some aphasics were watching the president giving a speech on TV.Since the president had been an actor earlier,making a good speech was no problem for him.He was trying to put his feelings into every word of his speech.

    But his way of speaking had the opposite effect on the patients.They didn't seem to believe him.Instead,they burst into laughter.The aphasics knew that the president did not mean a word of what he was saying.He was lying!

    Many doctors see aphasics as people who are not completely normal because they lack the ability to understand words.However,according to Dr.Sacks,they are more gifted than normal people.Normal people may get carried away by words.Aphasics seem to understand human expressions better,though they cannot understand words.

    It was once common to regard Britain as a society with class distinction. Each class had unique characteristics.

    In recent years, many writers have begun to speak of the 'decline of class ' and 'classless society ' in Britain. And in modern day consumer society everyone is considered to be middle class.

    But pronouncing the death of class is too early. A recent wide-ranging study of pubic opinion found 90 percent of people still placing themselves in a particular class; 73 percent agreeed that class was still a vital part of British society.; and 52 percent thought there were still sharp class differences. Thus, class may not be culturally and politically obvious, yet it remains an imprtant part of British society. Britain seems to have a love of stratification.

    One unchanging aspect of a British person's class position is accent. The words a person speaks tell her or his class. A study of British accents during the 1970s found that a voice sounding like a BBC newsreader was viewed as the most attractive voice. Most people said this accent sounds 'educated ' and 'soft '. The accents placed at the bottom in this study, on the other hand, were regional(地区的) city accents. These accents were seen as 'common ' and 'ugly '. However, a similar study of British accents in the US turned these results upside down and placed some regional accents as the most attractive and BBC English as the least. This suggests that British attitudes towards accent have deep roots and are based on class prejudice.

    In recent years, however, young upper midder-class people in London, have begun to adopt some regional accents, in order to hide their class origins. This is an indication of class becoming unnoticed. However, the 1995 pop song ' Common People ' puts forward the view that though a middle-class person may ' want to live like common people ' they can never appreciate the reality of a working class life.

    John Winston Ono Lennon (9 October 1940-8 December 1980) was an English rock musician, singer, songwriter, artist and peace activist who gained worldwide fame as one of the founders of The Beatles. As a member of the group, Lennon was one of the leading singers and co-wrote most of the band's songs with bassist(低音歌手) Paul McCartney.

    In his singing career, Lennon wrote and recorded songs such as Give Peace a Chance and Imagine. Lennon showed his rebellious(反叛的) nature and cleverness on television, in films such as A Hard Day's Night, in his books such as In His Own Write, and in press conferences(新闻发布会) and interviews. He was controversial(有争议的) through his work as a peace activist, artist and author.

    Lennon had two sons: Julian Lennon, with his first wife Cynthia Lennon, and Sean Ono Lennon, with his second wife, avant-garde(前卫) artist Yoko Ono. After a retirement from 1976-1980, Lennon reemerged(再度出现) with a comeback album, but was killed one month later in New York City on 8 December 1980. In 2002, respondents to a BBC poll(投票) on the 100 Greatest Britons voted Lennon into the eighth place. In 2004, Rolling Stone magazine ranked Lennon number 38 on its list of "The Immortals(不朽的): The Fifty Greatest Artists of All Time" and ranked The Beatles number one.

    University of Pennsylvania researchers say that for the first time they have linked social media use to increases in depression and loneliness. The idea that social media is anything but social when it comes to mental health has been talked about for years, but not many studies have managed to actually link the two. To do that, Penn researchers, led by psychologist Melissa Hunt, designed a study that focused on WeChat, Snapchat and Instagram.

    The study was conducted with 143 participants, who before they began, completed a mood survey and sent along photos of their battery screens, showing how often they were using their phones to access social media. "we set out to do a study which attempts to imitate real life." Hunt said.

    The study divided the participants into two groups: The first group was allowed to maintain their normal social media habits. The other, the control group, was restricted to 10 minutes per day on social media. The restrictions were put in place for three weeks and then tested for now comes such as fear of missing out, anxiety, depression and loneliness.

    The results showed a very clear link between social media use and increased levels of depression and loneliness." Using less social media then you normally do would lead to significant decreases in both depression and loneliness " Hunt said.

    Social media invites what Hunt calls "downward social comparison." "When you're online, it can sometimes seem that everyone else is cooler and having more fun and included in more things and you're left out," Hunt said. And that's just generally discouraging. "Every minute you spend online is a minute you are not doing your work or not meeting a friend for dinner or having a deep conversation with your roommate." And these real life activities are the ones that you can encourage self-esteem and self-worth, Hunt added.

    "People are on their devices, and that's not going to change," she said. But as in life, a bit of control goes a long way.

Standing on the South Pole at the start of the year with the wind blowing across the Antarctic, travel blogger Johnny Ward felt a wave of relief.

Just a week before, in early January 2024, he'd struggled through snow and ice to climb to the top of the Vinson Massif, Antarctica's highest peak. Years before, in 2017, he'd become the first Irish person to visit every country in the world.

Now, after decades of traveling and mountaineering, Ward could claim another world first—the Ultimate Explorer's Grand Slam (大满贯), which involves reaching the highest peak on every continent, and visiting both the North and South Poles in addition to visiting every country.

"I feel relieved," Ward recalled as he slowly made his way back to his home in Thailand after climbing to the top of the Vinson Massif and then setting foot on the South Pole. "But also I'm aware I'm a normal guy, not a world-class athlete, so I guess it was more about resilience and determination more than any ability. Although I met with lots of barriers, I overcame them one by one."

Ward had previously devoted a decade of his life, between 2007 and 2017, to visiting every country in the world. The incredible journey saw him hitchhike (搭便车) a ride on a container ship from Oman to Socotra in Yemen, travel overland from Cairo to Cape Town and travel from South Korea to Australia by bus and boat.

"It had been a huge life goal, over a decade of my life, and then when I finished that I was aimless and had no idea what to do next," he said. "I started eating badly, drinking too much, putting on weight and I ignored my business."

Ward decided that the best way to overcome this was to challenge himself again. He began running ultramarathons (超级马拉松) and climbing mountains, and soon found that with extreme purpose and direction, he was back to loving life again.

So where will Ward go next? Space? The bottom of the Mariana Trench, the deepest point of the ocean? "All good things come after suffering, and I want to share that with people. So that's the next plan," he said.