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"There are some microplastics in normal, healthy arteries (动脉)," said Dr Ross Clark, a researcher who led the study. "But the amount there is really, really different when they become diseased with symptoms."

Clark and his team measured microplastics and nanoplastics in the dangerous, fatty plaque that can build up in arteries, block blood flow, and cause strokes or heart attacks. Compared to the walls of healthy plaque-free arteries, plaque buildup had 16 times more microplastics — just in the people who didn't have symptoms. In people who had experienced stroke, mini-stroke, or vision loss, the plaque had 51 times more microplastics.

Previous research had found that people with microplastics in their arterial plaque were more likely to have a heart attack or die. To investigate why, Clark studied samples (样本) from 48 people's carotid arteries, the pair of superhighways in your neck that channel blood to your brain. The difference in the number of microplastics surprised him, but his team found another concerning trend, too. Cells in the plaque with lots of microplastics showed different gene activity from those with low microplastics.

In the high-plastic environment, one group of immune cells had switched off a gene that's associated with turning off inflammation (炎症). Clark's team also found genetic differences in a group of stem cells thought to help prevent heart attacks and strokes by reducing inflammation and stabilizing plaque.

"Could it be that microplastics are somehow changing their gene expression?" Clark said. "There's more research needed to fully establish that, but at least it gives us a hint as to where to look."

But scientists in India studied audio (声音的) recordings of birds in the rainforest. They said they didn't find proof to support this idea about sound traveling better. It was one of the ideas about environmental factors. Another idea is that birds sing at dawn because it's too dark to look for food.

"We didn't find much support for some of these environmental reasons suggested in past studies for birds singing more at dawn," said Vijay Ramesh, a researcher at Cornell University.

The researchers didn't find one clear reason why the dawn chorus happens, but they found some support for the ideas that the early morning noise is about birds marking their territory after being inactive at night and talking about finding food.

The team analyzed recordings from audio recorders placed at 43 locations in the Western Ghats mountain range in southern India, which is known as a biodiversity hotspot. They examined sounds of what they determined were 69 different species of birds. They studied recordings from the hours around dawn and the hours around dusk to compare activities.

Unsurprisingly to anyone who's been roused by bird calls, the vast majority of species they studied had significantly higher vocal activities at dawn compared to dusk.

After graduating in 2017 and stepping into the highly competitive online clothing industry, Ren realized he needed to find a specialized market. His solution: custom wooden plaques. He founded a company in 2022. "Each piece is tailor-made. It's nearly impossible to find the same product on the market," Ren explained. "The price per order attracts quality customers who place large orders."

Last year, his craft earned him over $688,000 — a success he owed to his much attention to detail and commitment to perfection. "We work with over 10 different types of wood. Every step, from design and cutting to carving, coloring and painting, is crucial," he said.

International orders began with a midnight message from an American client two years ago. After producing five design variants, Ren waited by his screen for hours without receiving any feedback. "I later realized it was simply the time difference," he recalled.

Another memorable project was for an American restaurant owner who initially requested four window-like plaques, each about 1.2 meters in diameter. After presenting several design drafts that showcased traditional techniques and craftsmanship, the impressed client increased the order to six pieces. "The owner went on to refer several other American customers to me," said Ren.

He believes that in the custom business, long-term relationships are key — each satisfied customer becomes a brand ambassador. Ren's small but dedicated (专心致志的) team of eight continues to breathe life into wood, with his plaques now decorating numerous businesses abroad.

Playing Guess Who

Learning who is who from history can get confusing so use this teaching strategy to help. Put those problem- solving skills to good use in history class (or others). Describe a time, place, or person from history with only three clues. The entire class has to try to figure out who or what you are referring to, then race to the whiteboard to write the answer.

Writing a Journal

Develop creative writing skills by asking each student to write a journal from someone else's viewpoint. There are many famous diarists who provide key insight into life through history. You could ask students to give a different diary and then ask them to read it in front of the class.

Brainstorming

Group brainstorming sessions are a great way to bring your students together to connect with whatever they are learning. Instead of thinking about the topic alone at their desk, they get to expand (详述) their ideas with other students in small groups. Use brainstorming worksheets for this activity idea.

Debating

Most students will have a view of what they're learning. Use this to your advantage and create a school activity of debating the pros or cons of whatever they are learning about. Get them to write down their main points on pieces of paper ahead so they can practice and be prepared for the debate. This can be done in front of the whole class and you can change the debaters each week.

1.写信目的；

2.简介摊位；

3.你的期待。

注意：

1.写作词数为100左右；

2.请按如下格式在答题卡的相应位置作答。

Dear Students' Union.

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