Transparent animals let light pass through their bodies the same way light passes through a window. These animals typically live between 

the surface of the ocean and a depth of about 3,300 feet—as far as most light can reach. Most of them are extremely delicate and can be 

damaged by a simple touch. Sonke  Johnsen, a scientist in biology, says, “These animals live through their life alone. They never

touch anything unless they're eating it, or unless something is eating them.”

And they are as clear as glass. How does an animal become see-through? It's trickier than you might think.

      The objects around you are visible because they interact with light. Light typically travels in a straight line. But some materials slow and

 scatter(散射) light, bouncing it away from its original path. Others absorb light, stopping it dead in its tracks. Both scattering and absorption

 make an object look different from other objects around it, so you can see it easily.

But a transparent object doesn't absorb or scatter light, at least not very much, Light can pass through it without bending or stopping.

That means a transparent object doesn't look very different from the surrounding air or water. You don't see it —you see the things

behind it.

   To become transparent, an animal needs to keep its body from absorbing or scattering light. Living materials can stop light because they

contain pigments(色素) that absorb specific colors of light. But a transparent animal doesn't have pigments, so its tissues won't absorb

 light. According to  Johnsen, avoiding absorption is actually easy. The real challenge is preventing light from scattering.

Animals are built of many different materials—skin, fat, and more—and light moves through each at a different speed. Every time light

moves into a material with a new speed, it bends and scatters.Transparent animals use different tricks to fight scattering. Some animals are

simply very small or extremely flat. Without much tissue to scatter light, it is easier to be see--through. Others build a large, clear mass of

 non-living jelly-lie(果冻状的)material and spread themselves over it .

    Larger transparent animals have the biggest challenge, because they have to make all the different tissues in their bodies slow down light 

exactly as much as water does. They need to look uniform. But how they're doing it is still unknown. One thing is clear for these larger animals, staying transparent is an active process. When they die, they turn a non-transparent milky white.

    For a 400-year-old art form, opera had a bad fame: overweight actresses singing the words which were hard to understand in one of those romance languages you were supposed to learn in high school. And with tickets costing as much as＄145 a performance, opera goers also had a certain appearance in people's mind: rich, well-dressed and old.

    But now opera companies around the country are loosening their ties and kicking off their shoes in an attempt to keep opera alive and take it to a younger and not so wealthy audience.

    Opera producers have found that to attract this crowd, they need to associate opera with common people. Because young people don't or won't come to the opera, companies are bringing the opera to them, giving performances in such unusual places as parks, libraries and public schools.

    The Houston Grand Opera's choice is the public library, where it performs “mobile operas”, shortened version(剧本) of child-friendly operas. This summer's production is Hansel &Gretel. By performing smaller versions of large productions, producers are able to make people interested while keeping costs at a reasonable level. The San Francisco Opera, which will be celebrating its 75^th anniversary this year, is staging Cinderella free of charge, keeping costs down by employing students from its Young Artists' Training Program.

    While many countries love their tea, UK citizens are particularly proud of being “tea people”. The average UK citizen consumes nearly 2 kilograms of tea each year.

    Tea only made its way to England in large quantities in the first years of the 17^th century. Tea from China and a few other Asian countries was being sold more widely in England at that time. Then tea was getting more and more popular among different social classes.

    There are many varieties of tea. Black tea mixtures are still the most common type drunk in the UK. Black tea is dark in colour, because the leaves have been allowed to oxidize (氧化) before drying. This is why we usually serve it with milk, although it is not uncommon to drink it black or with lemon. You may still find tea made with loose tea leaves, served up in a pot, and poured into the best china cups with saucers (茶托) for visitors.

    Tea is still a large part of daily life in the UK today, but it seems to be on the decrease. The amount of tea sold in the UK fell by more than 10% in the five years leading up to 2002, and has been dropping ever since. Tea sales fell by 6% in 2014 alone, and most restaurants report selling more than twice as many cups of coffee as they do tea. More than ￡1 billion was spent on coffee in high street stores in 2013, more than twice what was spent on tea bags.

    Still, what goes around comes around; it's sure to become fashionable again.

    MacArthur's love for sailing dates back to when she was just four years of age, when she first got the opportunity to have a try. "I'll never forget that feeling as a kid of setting foot on a boat for the first time," MacArthur said. "It's kind of struck me that this boat had everything we needed to take us anywhere in the world. And as a child, that opened up everything," she explained how it felt like the "greatest sense of freedom".

    This experience lighted a passion within MacArthur. She knew then that she wanted to sail around the world. She had no idea how to achieve it — growing up in the countryside, it wasn't the most obvious career path — but she knew that was what she wanted to do at some stage. So, she acquired knowledge and saved up for years to seek a career in sailing. She would have potato and beans every day for eight years so that she could save up to buy the right equipment. By reaching certain financial goals and asking technical questions about sailing, MacArthur felt as though she was getting closer to her ambitions.

    "When you know where you're going, you can actually get there — even if it seems impossible. The impossible could be possible and aiming high is not necessarily such a crazy thing to do." And it seems that MacArthur's drive to become a sailor went beyond her expectations. At the age of 24, she started to receive media attention after participating in the Vendee Globe, a single-handed non-stop yacht (游艇) race that goes around the world. She came in second place. Some three to four years later, MacArthur chose to sail for 71 days and 14 hours, covering more than 26,000 miles during the course of her journey. This led to MacArthur scoring a new world record in 2005, as the fastest person to sail around the globe single-handedly. While this record has since been surpassed, MacArthur is still considered as Britain's most successful off shore racer.

In May 2019, a friend who had previously been involved in the Restless Development Sierra Leone Business Brains project encouraged me to apply for the "Saving Lives II" project. Seeing this as an opportunity to move closer to my ambition of working in the medical field in the near future, I eagerly seized the chance. Fortunately, my performance during the interview led to me being awarded the role. 

Following the basic training, I was sent to volunteer in Kurubonla, a remote community located in the northern region of Sierra Leone. This assignment presented challenges such as limited road access and communication networks. At first, I felt concerned about being sent there, but with a determined mindset, I set out on the journey, driven by a passion to contribute to my country's development and to push my personal boundaries. 

As I got to know the community, I quickly realized that the challenges extended beyond language barriers and cultural differences; there was also a sense of isolation from my peers. However, I refused to allow these challenges to stop me. I threw myself in my duties, working together with local leaders and community members to identify the most pressing needs. Together, we carried out the projects aimed at improving healthcare, education, and infrastructure (基础设施). Additionally, I organized workshops and training courses to share my knowledge and skills with the locals. 

Over time, I witnessed the positive impact of our collective efforts. Healthcare facilities improved, the number of students in schools increased, and the overall quality of life in the community showed signs of improvement. These achievements were not solely mine; they were a testament to the cooperative spirit and commitment of the entire community. 

When it comes to architectural accomplishments, humans like to think they stand at the top. That is to underestimate the astonishing achievement s of social insects; for example, white ants raise skyscraping nests. The true master builders of the insect world, however, are the hundreds of species of stingless bees.

In a new study, Ms. Di Pietro and her colleagues observed over 400 colonies of the stingless bee species in a large bee house in Brazil in 2022 and 2023. Around 95% of the colonies exhibited honeycombs（a structure made by bees） built up in horizontal layers（水平分层）, like tiered wedding cakes, while the rest adopted a spiral（螺旋的） structure.

Since the stingless bee shows a strong preference for a horizontal-layer honeycomb structure, it's surprising that spiral honeycombs occur. The team confirmed that there was no difference in the average cell-building rate between the two styles, and therefore no efficiency advantage.

In order to rule out a genetic explanation for the different styles, the researchers transplanted workers from colonies that built in one tradition to colonies that built in the other, having first emptied the host structures of their native adults. The imported workers soon switched to the local style, which was then continued by the colony's young insects as they eventually matured into workers.

Dr. Tom Wenseleers guessed that the bees may switch styles as a way of coping with the build-up of small construction errors made by their fore-runners. Such a process, in which multiple organisms indirectly affect each other's behavior through the traces they leave in their environment, is known as stigmergy（共识主动性）. The researchers later introduced a sign of spirals to the otherwise perfect horizontal-layer honeycombs, and found that it did indeed cause the bees to switch to building spirals.

These results suggest that stingless bees can pass on different building traditions across generations and individuals needn't be instructed by their peers. "The findings are the clearest demonstration of cultural differences naturally appearing in insects. Insect culture would once have been thought impossible," says behavioral biologist Andrew Whiten, who wasn't involved in the research. "Less than a century ago, culture was thought to be uniquely human."