The discussion on renewable energy has been going on for at least a decade and people have relied on fossil fuels almost entirely for more than a century. However, the situation when fossil fuels were the most efficient and the cheapest source of energy has been left far in the past. Many countries such as Germany and Sweden have already made significant efforts to fix this situation, employing numerous power plants working on the renewable resources of energy. The most effective among these resources is geothermal（地热的）energy.

    Geothermal energy does not depend on the world's economic and political situation as strongly as fossil fuels do. Besides, extracting（提炼）fossil fuels adds to the price of energy produced from them. Therefore, geothermal energy is much cheaper than traditional ones, saving up to 80% of the costs over fossil fuels.

    Being a renewable resource, geothermal energy produces less waste and pollution than traditional energy sources. In geothermal systems, carbon dioxide makes up about 10% of air produced. Overall, in order to produce the electricity that can be used for one hour, the geothermal systems produce 0.1 pound of carbon dioxide and other harmful gases. For a comparison, a power plant producing from gas produces up to 2 pounds of carbon dioxide into the atmosphere, and those power plants that work on coal（煤）produce an astonishing 3.6 pounds of greenhouse gases.

    Low costs is another reason why using geothermal power plants should be the first choice for many countries. Geothermal heat systems require 25% to 50% less energy for work compared with the traditional systems for heating or cooling. Besides, geothermal equipment is less big: due to the very nature of geothermal energy, geothermal power plants have only a few moving parts, all of which can be easily sheltered inside a relatively small building. What's more, the life span of geothermal equipment is rather long. All these make geothermal power stations easy to build and keep.

    Healthy eating doesn't just mean what you eat, but how you eat. Here is some advice on healthy eating.

    Eat with others. It can help you to see others' healthy eating habits. If you usually eat with your parents, you will find that the food you eat is more delicious.

    Listen to your body. Ask yourself if you are really hungry. Have a glass of water to see if you are thirsty—sometimes you are just thirsty, you need no food. Stop eating before you feel full.

    Eat breakfast. Breakfast is the most important meal of the day. After you don't eat for the past ten hours, your body needs food to get you going. You will be smarter after eating breakfast.

    Eat healthy snacks like fruits, yogurt or cheese. We all need snacks sometimes. In fact, it's a good idea to eat two healthy snacks between your three meals. This doesn't mean that you can eat a bag of chips instead of a meal.

    Don't eat dinner late. With our busy life, we always put off eating dinner until the last minute. Try to eat dinner at least 3 hours before you go to bed. This will give your body a chance to digest most of the food before you rest for the next 8—10 hours.

    Just ask any new parent: Adding a baby to a household can also add stress to a career. Now, a new study backs that up with some astonishing numbers: After science, technology, engineering, and mathematics(STEM)professionals become parents, 43%of women and 23% of men switch fields, transition(转变)to part-time work, or leave the workforce entirely.

    Many researchers and parents already knew that STEM can be unwelcoming to parents, particularly mothers. But" the considerable departure was astonishing, "says Erin Cech, an assistant professor of sociology at the University of Michigan in Ann Arbor and lead author of the study, published in the Proceedings of the National Academy of Sciences. For both genders, "the proportions were higher than we expected."

    The surprisingly high reduction rate for men also highlights that" parenthood in STEM is not just a mothers' issue; it's a worker issue, "Cech says. She hopes that the findings" might motivate changes, "such as more paid parental leave from both government and employers and policies that better support flexible work time without a tight routine. "We are not suggesting that people who want families should avoid STEM; that's not the solution," she emphasizes.

    By 2018, 78% of new fathers were still working in STEM, the vast majority full time. For new mothers, 68% were still in STEM, but only 57% worked full time. For professionals without children, on the other hand, 84% of men and 76% of women were predicted to still be working in STEM full time in 2018. For the new parents across all fields, 16% of women were working part-time and 15% had left the workforce, as compared with just 2% and 3%, respectively, for men. These sharp differences make clear that, even though the reduction rate for fathers is higher than expected, mothers still face particular career challenges.

    People like to post their selfies(自拍照) on social media. To know more about it, scientists at Syracuse University in New York recently did a research and came up with some surprising findings.

    People who post selfies and use editing software to make themselves look better show behavior connected to narcissism(自恋), the researchers said. Makana Chock, a professor from Syracuse University, said because social media is mostly used by people to share unimportant information about their lives, it is a good place for people to "work towards satisfying their own vanity." Those "likes" under their Facebook selfies make them feel good.

    Besides, people who post group selfies show a need for popularity and a need to belong to a group, the research found. Some people feel "peer(同伴) pressure" to post selfies and some follow the popular belief that if there is no picture of an event or experience, it did not really happen. "Anyway, it shouldn't be seen as negative. People get sense of satisfaction especially when they get likes. And it does no harm," Chock said.

    Other findings from the study include: There are no major differences on how often men and women post selfies and how often they use editing software. But men who post selfies showed more of a need to be seen as popular than women who posted selfies.

Chock said posting selfies on social media is not all that different from what people have done for many years. On trips and special events, our parents and grandparents used cameras instead of phones to take photos. They would bring back photos to show friends and family. You had no choice but to look at them. You probably commented about how nice everyone in the photos looked, especially children and the person showing the photos. They were happy to hear your comments. That was the old way of "clicking like". On social media, however, people can decide not to look at photos — even if they click "like".

Hamlet, the prince of Denmark, has come back from university to find that his father, the old king, is dead. His mother has married his father's brother, Claudius, who is now king of Denmark. Hamlet is shocked that his mother has married so soon after his father's death, and angry that she has married Claudius.

Soon, a ghost (幽灵) is seen walking on the castle walls. The ghost looks like Hamlet's father, the dead king. When Hamlet sees the ghost, he is told that it is the ghost of his father. "I am your father's spirit," the ghost tells Hamlet. It tells him that Hamlet's father did not die naturally, but was murdered by his brother Claudius. As the king slept, Claudius put poison into his ear, causing the king a painful death. The ghost tells Hamlet to take revenge on Claudius for murdering his father.

Hamlet can't believe his mother would marry the man who murdered her husband. He becomes depressed, and he thinks about killing himself: "To be or not to be, that is the question. " Hamlet decides to pretend he is mad while he tries to find out if King Claudius really killed his father. Claudius soon notices that Hamlet is acting strangely, so he asks Polonius, his adviser, to discover if it is true…

On a chilly autumn morning in the Italian countryside near Larderello, Tuscany, the misty landscape reminded me why the area is nicknamed the Devil's Valley. The land here is a web of natural cracks in the rock that let a mix of steam and gases reach the surface.

Unlike the rolling hills and cypress-lined roads of other parts of Tuscany, the landscape here is covered with dozens of grey cooling towers puffing white vapors. The deafening roar of a turbine (涡轮机) at the Valle Secolo geothermal (地热的) plant breaks the quietness, but its violent spinning transforms steam rising from underground into energy for 150,000 families in the region. About 30% of Tuscany's electricity comes from this energy source. After producing electricity, the leftover steam heats water for nearby districts.

This underground energy has recently proved a vital resource. Italy greatly depended on Russian fossil fuels and in 2023 Italians bore the world's highest household electricity bills. Factories cut down production and households had to turn down their heaters. But residents of the Larderello area spent the winter in warm homes, thanks to the local geothermal plants working 24/7.

Bruno Della Vedova, president of the Italian Geothermal Union, hopes that in the future other Italian regions could benefit from such a resource, which is extremely important when the whole world looks to transition to renewable energy.

While countries like Iceland and Kenya are taking advantage of their geothermal resources, the industry's growth has made slow progress in Italy. High set-up costs and difficulties in extraction present significant barriers. And new plants often run into opposition from nearby communities over health concerns.

Italy sits on a geothermal sweet spot. Especially below Larderello, as Della Vedova says. A vast reservoir (储备) of steam and water is trapped between Earth's inner heat and a layer of clay-heavy rocks. High temperatures lead to the formation of steam directly inside the reservoir, providing a significant source of energy.

But while heat from Earth's core is practically endless, the water it heats within the planet are not. So Della Vedova says restoring underground water supplies and using them sustainably is critical for the future. "We can't take advantage of a geothermal resource at will," he says.