They say music is universal, and it seems to be true since wherever we go, we see people listening, playing or dancing to it. We tend to think that music is larger than our cultural differences and shows the deeper connections between us.

    But according to a recent study published in the Current Biology, music doesn't speak to everyone. There is a condition, the researchers argue, called "musical anhedonia". They say that those who have this condition may have few abilities to experience pleasure from music.

    For the study, 30 people listened to the same, mostly classical music pieces. They were then asked to complete a questionnaire on how they felt about the music. At the same time, the researchers measured their heart rate and skin reaction, which are considered physiological measures of feelings.

    According to the researchers, most of the people in the study got pleasure from the music. They had a quicker heartbeat and sweatedmore. However, a small number of them had very little and even no pleasant feeling while they were listening to the music. These people had none or very few of the physical signs which the others in the study experienced.

    The researchers say that this means people have different abilities to enjoy music and that "there are people who specifically can't enjoy music at all"

    To study the condition more deeply, another group of scientists, at Columbia University, US, researched brain activities. They found that the key is the blood flow to the reward system in the brain. People who got less pleasure from music had comparatively lower blood flow to areas involved in the reward system of the brain when they were listening to music.

    The lower blood flow makes it more likely that the brain's "reward system" will be inactive. And it will produce less of the "pleasure chemical" dopamine. As a result, people get less pleasure from music.

    If the research is correct, according to National Public Radio, there are simply people who just don't get music. They may get pleasure from many things, but a good tune isn't one of them.

    Sheridan is a town in Indiana, USA. There are lots of trees near the public schools in the town. Their leaves turn sunlight into energy（能量）.

    In Sheridan, the sun not just provides energy for plants. It keeps schools running, too. The schools use solar panels（太阳能电池板） to turn sunlight into energy.

    The science behind solar energy is not new. But Sheridan Community Schools is the first school district(学区) in Indiana to be completely solar-powered. The district finished putting in solar panels for all three of its schools in 2016. Some of the panels can turn to follow the sun across the sky.

    In 2008, fewer than 1. 000 schools used solar power. By 2014, there were 3, 727 schools with solar panels in the USA. These numbers come from a report by the Solar Foundation. Roxie Brown, a program director there said that the number of schools with solar panels has continued to go up since 2014.

    Solar energy has some advantages over other energy sources(来源). Sunlight is a renewable source, which means it won't run out. Solar panels don't harm the environment. Also, sunlight is free. So by using solar power, schools can save money on energy costs.

    Brown thinks more schools should run on solar energy. "The sun is Earth s energy source," she says. "We're trying to make it the energy source for our houses cars and schools, too."

    But using solar energy isn't always easy. Solar panels can be expensive to put in. The panels also take up space. But for many schools, going solar is worth it.

Drinking tea has many advantages. It makes people feel less tired, clears heat inside the human body and helps people lose weight. As you add a cup of tea to your daily life, please check the following {#blank#}1{#/blank#} advice. 

Drink it hot. Tea oxidizes (氧化) quickly, so it is suggested that you drink it hot. 

Do not drink too much strong tea. It will probably be {#blank#}2{#/blank#} to your stomach and make you feel sick if you make the tea too strong. 

The best time to drink tea is between meals. It may not make you have a strong wish to eat when your stomach is full. 

Do not drink with medicine. It may {#blank#}3{#/blank#} the medical result. You can drink tea two hours after you take medicine. 

Green tea is the best {#blank#}4{#/blank#} for office workers. Why? Because green tea helps stop the bad result of the computer. 

A marathon is a long running race of 42.195kilometres. The first Olympic Marathon was held in Athens. Now, many cities host their own marathons every year. Some of the well-known marathons around the world are the New York City Marathon, the Boston Marathon and the Tokyo Marathon. Among them, the Boston Marathon is the oldest yearly Marathon in the world. As time goes by, the sport has become more than just a race.

Themes(主题) make marathons fun and meaning. Runners run for helping sick kids, memorizing important events, or just enjoying nature. A famous marathon in Gisborne, New Zealand, is known for being the first city in the world to welcome the sunlight every day. Runners can greet the sunrise as they run along the golden sandy beaches.

Marathon routes(线路) let people know more about this old sport. Some routes are very challenging for runners. Runners of all skill levels can sweat(流汗) freely and push their limits(极限). Some routes are well planned for runners to explore the many sides of a city. For example, the route of the Great Wall Marathon takes the runners along the great wonder of the world. In fact, it's also a chance to get to know Beijing, its people and local culture.

A marathon is quite a journey for runners to enjoy the run, challenge themselves and experience the culture. There is so much more behind the race for us to explore.