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Over the past 15 years, China has built the world's largest high-speed railway network. The first high-speed line, officially (launch) in 2008, now stretches over 45,000 kilometers, connecting more than 500 cities across the country. These railways have greatly cut travel time and boosted regional(develop), making long-distance travel faster and more convenient than ever before.

Each line plays a special role. The Beijing–Shanghai High-Speed Railway cuts travel time between the two cities from 10 hours to just 4.5 hours, having increased passenger flow nearly 60% in the past decade. The Fuxing trains connect separate economic zones, giving businesses a larger and (efficient) market. In the Guangzhou–Shenzhen–Hong Kong corridor, the number of daily passengers(rise) from 100,000 to over 300,000 since 2018. The Lanzhou–Xinjiang High-Speed Railway is the only line crosses the vast Gobi Desert, bringing new opportunities to remote areas. The Qingdao–Jinan line (feature) the country's first self-developed "Fuxing" bullet trains, reaching speeds of up to 350 km/h.

These railways also benefit local people: over 2 million jobs have been created near stations,(earn) an annual income of 20,000–50,000 yuan for families. In 2023, China completed the expansion of the high-speed network to cover all provincial capitals,improving connectivity for millions. A new national railway law will take effect on January 1, 2026, providing strong support for these engineering (wonder).

His interest in diversifying his skills3 after he came across a video of traditional Chinese-styled dance on YouTube. Ever since, he has been closely following Chinese4 and watching numerous videos to learn more about the5 style.

Filippi's chance came when he was invited to6 for a Chinese New Year celebration in Florence. He has since7 committed himself to the art form, learning several pieces and putting his passion into8.

"The biggest difference that I found is the way of the9 express among dances," says Filippi, adding that he needed to shift from the dynamic moves of hip-hop to the10 movements of Chinese dance. Despite various obstacles, Filippi's efforts have not gone11. His friends shared videos of his performances on social media, receiving millions of12.

Filippi believes learning about different cultures is priceless. "I like to13 a person as a book," he says. "Embracing different traditions and cultures, such as Chinese culture and many others, is like adding new14 to my book, making it more15 and wonderful."

In a recent study, researchers tested whether simulated lunar soil could be used in 3D printing. They used a powerful laser to melt a man-made version of moon dust, known as regolith simulant, and printed it layer by layer to form small objects. The printed pieces were found to be hard and able to withstand high temperatures.

To understand how reliable this method might be, the team carried out experiments under different conditions. They discovered that the final product depended greatly on the surface onto which the soil was printed. When printed on stainless steel or glass surfaces, the material did not stick well. However, it bonded strongly with alumina-silicate ceramic. The two substances formed stable crystals together, which improved mechanical strength and the material's resistance to sudden temperature changes.

The surrounding environment also played an important role. Changes in oxygen levels, laser power and printing speed all affected the quality of the material. Because the moon has an extreme environment, including vacuum, fine dust and sharp temperature differences, it is difficult to fully recreate such conditions in a laboratory. This means that more testing is needed before the technology can be used in real missions.

Despite these challenges, researchers believe this approach could support future programs such as NASA's Artemis missions, which aim to establish a long-term human presence on the moon. By using local materials instead of transporting large amounts of supplies from Earth, astronauts may save both time and cost.

In addition, the findings may have value beyond space exploration. Learning to manufacture useful products with limited resources could help improve sustainability on Earth and offer new solutions to material shortages in the future.

According to large study group analysis and systematic reviews, cancer risk, particularly colorectal cancer, begins to increase when red meat intake exceeds about 350-500 grams of cooked weight per week. That's roughly three to four servings per week. Beyond this, the risk rises in a dose-dependent way. For example, an analysis found that for every additional 100 grams of red meat per day, colorectal cancer risk increased by about 12%-17%. For processed meat, the evidence is even stronger and more consistent. Processed meats — like bacon, sausages, ham, and cured meats — were classified by the World Cancer Research Fund as Group 1 carcinogens, meaning there is sufficient evidence that they cause cancer in humans.

Lab-grown meat is produced from animal cells and is not the same as salt-cured processed meat. There's no long-term human data yet, so any risk would depend on how it's made and cooked, with lower exposure expected if no heavy processing is applied and high-temperature roasting is minimised. Lab-grown meat is indeed made by quickly growing animal cells in a controlled environment, but not by using cancer cells. The cells used are normal animal stem cells, which are grown and differentiated into muscle and fat cells, being carefully monitored to ensure they grow safely and do not become abnormal or cancerous.

Some people worry about safety because the cells multiply quickly, but this is completely natural; it's the same way stem cells grow and repair tissue in animals. The process is closely monitored to ensure the cells remain healthy and normal. In fact, lab-grown meat avoids some of the health risks linked to traditional meat, such as bacteria from slaughterhouses and harmful chemicals from processing.

Marineland, located by Niagara Falls, shut down in 2024 due to rising debts. Without income for whale care, the park could no longer provide proper care for its 30 belugas. Most were born in captivity; consequently, they lack essential survival skills, making their release into the wild a death sentence.

In 2025, in a desperate attempt to save the belugas, the park begged the Canadian government to allow their transfer to a foreign marine facility — a last hope for their safety. Unexpectedly, however, federal officials turned down the request flatly. They cited laws that ban the use of cetaceans for entertainment, arguing that relocating the whales would only keep them confined (受限) in tanks, which went against the spirit of the law.

This refusal put the park in a cruel dilemma: without support or relocation approval, it might have to euthanize the whales. Once kept for human amusement, these belugas now face being forgotten — a tragic "selective abandonment," unlike well-known species that draw public concern.

Above all, their suffering reveals a painful truth: humans often use animals for pleasure and profit, only to cast them aside when they are no longer useful. In fact, protecting animals means keeping our promise to care for those we have taken in, especially when they are at their most vulnerable. These belugas did not choose to be confined to tanks; they were brought into captivity by humans. Thus, we owe them a chance to live a decent life, not a lonely and unnecessary death.

International Science Olympiads (ISO)

Held July-August (e.g., Singapore), ISO covers 6 core subjects like Physics, Chemistry, and Biology. It includes rigorous 3-hour theory exams and 4-hour experiments, comprehensively testing academic knowledge and practical skills. Only the top 1% of global students qualify to compete here, utilizing labs equipped with basic sensors.

Eligibility: Students aged 16-19 who have won national-level contests and demonstrated exceptional aptitude in their chosen subject.

Note: Candidates need to undergo training for 6+ months and check visa application deadlines at least 2 months in advance to avoid delays.

Int'l High School Film Festival (IHSFF)

Held Oct-Nov (Tokyo, Paris), it showcases 5-15 minute student films (drama, documentary). Highlights include professional jury feedback and cinema screenings.

Eligibility: Ages 15-19 with original works.

Note: Submit 3 months earlier online and avoid unapproved materials.

World Schools Debating Championships (WSDC)

Rotating countries Dec-Jan (S. Africa 2023, Canada 2024), it features 3-on-3 English debates on AI privacy and social equality. Each debate has 7 parts, and the grand final is covered by BBC.

Eligibility: Ages 14-18 on national teams with fluent English.

Note: Practise 2-3 formats weekly and adjust time zones.

THIMUN (Model UN)

Hosted in The Hague every January, this Model UN gathers 2,000+ students from 100+ countries. They simulate (模拟) UN delegates to debate climate mitigation and refugee (难民) rights, then draft resolutions. It improves public speaking and critical thinking.

Eligibility: Ages 14-18 via school teams (5-8 students).

Note: Research topics 1-2 months prior and follow debate rules.