Light travels at a speed which is about a million times faster than the speed of sound. In one second, light travels about 300,000 km, but sound travels only 344m. You can get some idea of this difference by watching the start of a race. If you stand some distance away from the starter, you can see smoke come from his gun before the sound reaches your ears. This great speed of light produces some strange facts. Sunlight takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light rays（光线）left the moon 1.3 seconds before they reached you. The nearest star is so far away that the light which you can see from it tonight started to travel towards you four years ago at a speed of nearly 2 million km per minute. In some cases the light from one of tonight's stars started on its journey to you before you were born.

    Thus, if we want to be honest, we cannot say “The stars are shinning tonight.” We have to say, “The stars look pretty. They were shining four years ago but their light has only just reached Earth.”

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The First Hello

    The man from the telephone department got off the bus, and made his way to the tea stall, wiping the sweat off his head, face, then slipping his handkerchief under his shirt to wipe his neck and back. It was a year ago that the phone line had been installed, six months later men from the public works department had come to put up the phone booth—a neat box-like structure, with a glass window, and wooden ledges, yellow in colour. And days after that, a painter had taken an entire day to colour in broad, black brushstrokes, the words: STD Booth, local and STD allowed.

    No one could tell that the last word had been misspelled. Besides, he had taken the entire day. After he had a cup of tea, he left, waving cheerfully. And now months later, someone else was here again.

    Everyone watched the man as he sat on the bench. No one said a word, and soon the sound of him slurping his tea filled the hot afternoon. A few leaves fell, heavy in the heat, and sometimes a car passed, on its way to the main city farther away.

    When the man had finished, he tried to pay but the tea shop owner who sat behind his steaming kettle and the washed upturned cups, waved him away.

    “You are our guest here.”

    So the man took his handkerchief out again and wiped his face.

    They crowded around him as he shut himself up in the phone booth. When the children pressed their nose against the glass, he shooed them away, as he took out a shiny black soon changed to an excited yell as they saw him dial a number, pressing a finger into the ringed dialer of the phone and letting it go all the way in a half-circle. A while later, they hear him say into the mouthpiece, “Hello.”

    “Hello,”the children around the booth took up the cry, the teashop owner broke into a smile and the men waiting for a bus smiled and said hello to each other. The sadhu(印度的僧人)who sat under the banyan tree nodded wisely. As the sound carried, more hellos were heard. The women winnowing grain giggled as they tried the word tentatively, the shepherds feeding their flocks called out to their sheep, laughing as they used the word.

    “It's a big occasion, ”said the headman, in an awed(敬畏的) voice.

    “It is.” agreed those around him. The telephone man emerged and handed over a small chit of paper to the headman. “This is the telephone number.”

    The headman looked at it respectfully as if it were a mantra(符咒). The others around him read out the numbers slowly, digit-by-digit.

    The telephone man was now too tired to notice the cheering around him. He knew he had to wait long before the bus to take him back arrived. As he sipped his second cup of tea, he remembered something else.

    “Oh, you can't start using the phone now. The minister will come next month and inaugurate it. ”

    No one said a word. No one was surprise. They had waited so long; a month more did not really matter.

    In the U.S., speaking more than one language fluently is not very common — except in Los Angeles, California. The city has one of the largest populations in the U.S. of young people between the ages of 18 and 34. More than half of them in Los Angeles are bilingual (会说两种语言的).

    Maria Elena Burgos, a mother of two American-born daughters, is cooking a Mexican breakfast. She says making Mexican food is just one of the many traditions in her home. Another is speaking Spanish to her children. “We want to keep Spanish somewhere in their learning too, not only at home.” Ms. Burgos thinks being bilingual will give them more opportunities in the competitive world. Knowing Spanish also means the children can talk with their relatives in Mexico.

     Ms. Burgos' daughters both want to know their family's culture. “We are doing this in order to go back to our roots because that's part of who we are,” they say.

    The U.S. Census Bureau (人口普查局) says more than half the adults in the Los Angeles area between 18 and 34 years old speak a language other than English at home. For the whole country, the number of bilingual adults is only 25 percent. The number of bilingual speakers has gone up since the 1990s.

    University of California Los Angeles professor Raul Hinojosa says that in the past, the children and grandchildren of immigrants (移民) did not continue to speak the parents' native language. But now the opposite is true.

    In the last ten years, more immigrant parents say they want their children to keep speaking their native language. Mr. Hinojosa calls their choice the “path of pride”. The decision to keep a native language is clear in Los Angeles now. And, as the number of minorities in the U.S. continues to grow, he thinks bilingualism will spread to the rest of the country.

    Chris Thomas used to think of Facebook as just a platform to get in touch with his friends. He now believes the social networking service with saving his life. The 28－year－old was diagnosed with muscular dystrophy(肌肉萎缩症) nine years ago and has relied on a wheelchair ever since.

    On July 15，2015，Thomas was getting ready for bed in his apartment，when a shelving(架子) fell onto his wheelchair and knocked him over，causing him to fall and hit the back of his head. After waking up from a few minutes of coma(昏迷)，he realized he couldn't reach the string used to get the doorkeeper's attention.

    His phone was nearby and had the Facebook application conveniently open，so he posted a status update that immediately got his friends worried—even some he hadn't spoken to in years. “It was amazing，friends from six different states who didn't know each other were connecting with each other to get me help，” Thomas said. “Now that's the power of social media! You have hundreds of people at your fingertips.”

    Eight minutes after the status went up，an old friend，Leah，got in contact with Thomas' friend Brad，whose wife was in the neighborhood，and before you knew it there were 12 Facebook friends in his apartment，who took him to the hospital at once. They showed up to the rescue at the perfect time. Minutes before they arrived，Thomas thought he was going to have a panic attack，which he often suffers from because of his illness，but he's doing better now.

    “It felt good to know that my friends，even those I haven't spoken to in the past，came to save me，” Thomas said. “They all came together .I would've never imagined it.”

    Kendrick Lamar hasn't had much luck when it comes to winning a Grammy. But that's OK： The US rapper(说唱歌手) has just won a Pulitzer Prize for his music.

    In 2014, in 2016, and again this year. Lamar was nominated (提名)for an album of the year Grammy. Each time, he was beaten out, first by Taylor Swift, next by Daft Punk, and most recently by Bruno Mars.

    But the Pulitzer Prize committee was inspired enough by Lamar's 2017 album, Damn, to award the 30-year-old its Pulitzer Prize in music on April 16. It's an amazing album that documents the real life of modem African-Americans in South Los Angeles with wildly accomplished beats and rhythms.

    Lamar's win is considered to be historical. 'The Pulitzers have long displayed their preference toward high art rather than the pop culture of the masses. So it's not just that no rapper has ever won a Pulitzer: no pop music maker has ever won one in the award's 75-year history.

    But Lamar is not just a singer—he's clever at using language. Like the best writers, his music describes small moments that illustrate (阐明) larger points. His songs are about his experience as a black man who grew up in California, struggled, got into trouble, and found his way out by working hard and making sense of the history and reality of racial problems in the US.

    “He's an artist who challenges idea,” said Ryan Coogler, director of the blockbuster(大片) hit Black Panther, for which Lamar created music. "One big theme in our film of,' What does it mean to be African?' Kendrick in his music is very exactly and directly challenging that question."

    Good artists entertain us, great artists make us think, and exceptional artists help us empathize (感同身受) .

    There are a lot of good, great, even exceptional artists in rock, pop, country, and hip-hop. But only Lamar has a Pulitzer Prize.

    If you wear glasses, chances are you are smarter. Research published in the famous British journal Nawre Conurunications has found — people who displayed higher levels of intelligence were almost 30 percent more likely to wear glasses.

    The scientist, studied the genes of thousands of people between the ages of 16 and 102. The study showed intelligence can be connected to physical characteristics. One characteristic was eyesight. In out of 10 people who were intelligent, there was a higher chance they need glasses. Scientists also said being smarter has other benefits. It is connected to better health.

    It is important to remember these are connections which are not proven causes. Scientists call this correlation. Just because something is connoted to something else does not mean one of those caused the other. And it's worth noting that what constitutes (构成)intelligence is subjective and can be difficult, if not impossible, to measure.

    Forget genes thought. Plenty of proof shows wearing glasses makes people think you are more intelligent, even if you do no, need glasses. A number of studies have found people who wear glasses are seen as smarter, hard-working and honest. Many lawyers this idea to help win their cases. Lawyer Harvey Slovis explained this. "Classes soften their appearance," he said. Sometimes there has been a huge amount of proof showing that people he was defending broke the law. He had them wear glasses and they weren't found guilty.

    Glasses are also used to show someone is intelligent in movies and people who wear glares have begun to shift. People who do not need glasses sometimes wear them for fashion only. They want to look worldly or cool. But not everyone is impressed by this idea, thought. GQ magazine said people who wear glasses for fashion are trying too hard to look smart and hip(时髦的). However, that hasn't stopped many celebrities (名人) from happily wearing glasses even if they do not need them. Justen Bieber is just one high - profile fen of fashion glasses.