Music is an international language. The songs that are sung or played by instruments are beautiful to all people everywhere.

    Popular music in America is what every student likes. Students carry small radios with earphones and listen to music before class, after class and at lunch. Students with cars buy large speakers and play the music loudly as they drive on the street.

    Adult drivers listen to music on the car radio as they drive to work. They also listen to the news about sports, the weather, politics, and activities of the American people. But most of the radio broadcast is music.

    Pop or popular music singers make much money. They make a CD or tape which radio stations use in every state. Once the popular singer is heard throughout the country, young people buy his or her tapes. Some of the money from these tapes comes to the singer. Wherever the singer goes, all the young people want to meet him or her. Now the singer has become a national star.

    Besides pop music, there are two other kinds of music that is important to Americans. One is called folk music. It tells stories about the common life of Americans. The other is called western or country music. This was started by cowboys who would sing at night to the cows they were watching. Today, any music about country life and the love between a country boy and his girl is called western or country music.

    Scientists have recreated a 1985 study of birds in Peru that shows climate change is pushing them from their natural environment. Thirty years ago, researchers studied over 400 kinds of birds living on a mountainside in Peru. In 2017, researchers looked again at the bird populations. They found that almost all had moved to higher places in the mountain. Almost all had decreased in size. And, the scientists say at least eight bird groups that started at the higher elevations (高地) had died out completely.

    The researchers say the birds might have moved up the mountain because of temperature changes. Or changes to food sources may have forced them to go higher. The findings were published in a science journal. The 1985 research has documented birds and other animals moving up in elevation (高地) in reaction to warming temperatures. Mark Urban, a biologist at a university, said this recent study was the first to prove that rising temperatures and moving to avoid them can lead to extinction.

    In 2016, Fitzpatrick, director and a co-writer of the study passed his notes, photos and other records to Benjamin Freeman. Freeman has been researching tropical birds for more than 10 years. He set out in August and September of 2017 to copy Fitzpatrick's study. His team used the same methods, searching the same places in the same time of year.

    Freeman's team wanted to see how things had changed for the bird groups since 1985. The average temperatures on the mountain had risen 0.42 degrees Celsius. His team placed 20 sound recording devices on the mountain to record the sounds of birds that might not easily be seen.

    Freeman said that the birds moved an average of 98 meters further up the mountain. He believes that temperature is the main cause of the birds' movement. Fitzpatrick noted that birds used to living in areas with little temperature change may be especially at risk because of climate change. He said, “We should expect that what's happening on this mountain top is happening more generally in the Andes, and other tropical mountain ranges.”

How was 2019 for you? Was it pleasant and full of joy? Or was it unpleasant and full of sadness? Either way, some good things happened this year that can warm your heart. Let's take a look.

A Rare Spotless Giraffe

A female giraffe was born at Brights Zoo in Tennessee recently—but unlike her mother she was born without any spots an unusual one.

Standing 14 to 19 feet tall, giraffes are the tallest land animals in the world. When mothers give birth, the young giraffes are already 6 feet tall, and other than in especially rare cases, they're born covered in brown spots. Brights Zoo in Limestone, Tennessee, announced that it welcomed the birth of a reticulated giraffe (网纹长颈鹿) without any spots on July 31st.

"Giraffe experts believe she is the only solid-colored reticulated giraffe living anywhere on the planet," the zoo said. The zoo's director, David Bright, said zoo staff had been reaching out to zoo professionals across the country inquiring about how unusual the giraffe could be. Zoo officials said the only record of a reticulated giraffe being born without spots was in Japan in the 1970s.

Mr. Bright said that the new giraffe might not have survived if she had been born in the wild. "Being solid-colored, she may not be able to hide quite well," said Bright. He also thought it was likely that the giraffe would be a "key target for illegal hunters" because she's so unusual.

Pictures of the young giraffe can be seen on the Brights Zoo Facebook page. In a picture, she, without her spots, stood next to her mother, a normal giraffe, in stark contrast. The zoo is asking the public to help name the newborn. People can choose one of four names available on the zoo's Facebook page. The names and their meanings are: Kipekee, meaning unique; Firyali, which means unusual or surprising; Shakiri, meaning she is most beautiful; Jamella, which means optimistic.

Bright said that the zoo looked at thousands of names and their meanings before settling on the four available. "Those four are the four the family really loves," Bright said. "So if she's named one of those four, we're very happy."

According to the Giraffe Conservation Foundation, there are only about 16, 000reticulated giraffes left in the wild — a more than 50% drop from approximately 36,000giraffes 35 years ago. There are about 117, 000giraffes across nine subspecies(亚种).Many of them are endangered or critically endangered.

Since 2001, robotic tools have revolutionized (彻底改变) the practice of surgery. They have greatly reduced the stress and physical demands normally placed on surgeons and have made certain procedures possible.

One example is telesurgery. Telesurgery, or remote surgery, is the use of technology that allows a surgeon to perform a procedure on a patient who is not in the same physical location.Normally, telesurgery relies on a wired connection due to concerns of harming the patient should a wireless connection drop during surgery, but China has made several advancements in wireless telesurgery based on 5G technology.

China achieved the first 5G-based remote operation in March 2019 involving a brain surgery procedure between a surgeon in Sanya and a patient in Beijing, a distance totaling nearly 3,000 kilometers, reported CGTN. More recently, a team of surgeons successfully completed remote micron-level (微米级别) eye surgery on rabbits located in a different city, reported China Daily. The rabbits were at the Sun Yat-sen University in Guangzhou, Guangdong province, whereas the surgical team who operated on them via a 5G robot were at the Hainan Eye Hospital in Haikou, Hainan province. "If everything goes well, 5G remote micron ophthalmic (眼科的) surgery will be available to humans within half a year," said Professor Lin Haotian, whose team led this trial.

Looking to the future, people hope that remote surgery could be regularly used to help injured soldiers on the battlefield while keeping surgeons at a safe distance. Some even believe that robotic systems, combined with AI, could one day surpass human surgeons.

Smart medical care has made breakthroughs during the past years at home and abroad. The booming (飞速发展的) online medical service meets the needs of the people and helps improve the medical treatment process.

It was not until photographer Rita Nannini left New York that she grew fascinated by the city's subways. While living in Manhattan for some 15 years in the 1980s and early 1990s, Nannini only commuted (通勤) on the one train-given the subway system's bad reputation. But after relocating to New Jersey for several years where subway is not an option, Nannini found that absence did make the heart grow fonder — maybe even for pizza rats. During her visit back to New York, Nannini nodded, noticing improvements in the subway's facilities.

While Nannini was waiting for a train, a bench on the platform opposite caught her attention due to the ever changing faces and characters. They were people of different accents, colors and beliefs. They were from all walks of life, a diverse mix of New Yorkers all there for their own different reasons. Having learned the teenagers' popular "End of the Line" challenge — boarding trains at random and riding them until their final destination; Nannini decided to visit every first and last stop across the NY subway's lines with her beloved camera.

Nannini's "End of the Line" experience saw her traveling some 665 miles across 26 routes in New York city. She took over 8,000 photos of the final stations, as well as the communities they served. In many cases, she rode the routes two or three times over to ensure she got "the shot". "The project really shows me how important the subway is, and how sustainable it makes our lives," she said 

"It's often said that my photos show the end of the lines — the last stops," she said. "But theend of the line is indeed the start for so many people. That made me think about who the people and the communities that live at the two ends are and what it is that the subway means to them."

Nannini was proud of her set of images directly challenging the traditions of story telling, which echoed both the boredom and excitement of travel on tracks.

Nannini enjoyed taking her time, starting her challenge in 2013 and only shooting the final photos last year. Her first monograph on the terminal stops of the NY subway was released in April 2023.

"When you drive in the suburbs, you don't have those encounters," she continued. "People enter your life on the subway. That's what strikes me most on my jouney on tracks."