2 . Would you take a trip if you couldn’t use your cellphone? A new tour company called Off the Grid is asking travellers to put their cellphones away and not even use them for photos. The company founder, Zach Beattie, is developing his business, using money he saved from a tech job at a mapping company. He’s hired guides for every trip but will help lead the first few himself.

The first trip is to Lisbon, Portugal, in July. It takes 7 to 10 days, with small groups of up to 16 people. Prices range from $1,500 to $1,650, including accommodations, meals and ground transportation. The plan includes at least three excursions (远足) and two social events, with an emphasis on unique experiences over bucket-list sightseeing. The tour also includes surfing lessons, yoga on the beach, a day of sailing and dinner with a local family.

“When you’re somewhere new, there’s a lot to see and a lot of cool and interesting people to meet,” Beattie said. “Your phone can distract (使分心) you.” The phone ban won’t be enforced quite as strictly as it seems at first glance. “We want it to be voluntary,” he said. “We’re not collecting phones and throwing them in a locked trunk. It’s held by you, but put in your pocket, and you state your intentions for the week, whether that’s checking your social media once or twice a day or a total blackout.”

Tour-goers also get a “dumbphone” without Internet access that’s loaded with numbers for group leaders and other participants, both for emergencies and to promote socializing. Participants may bring regular cameras, but Beattie is hiring a photographer for each tour so there will be plenty of photos to remember the trip. Once the trip is over, participants will have access to those photos for use in social media posts.

5 . Joao Carlos Martins is a famous pianist and conductor. However, his career has been ________ and his life has taken him in many different ________.

As a teenager Martins began to perform in concerts. But in his late twenties, he had to ________ after badly breaking his arm. It was really a terrible time. He couldn’t look at a piano or ________ listen to music. ________, he decided to become the manager of a boxer, who won the world championship later. This ________ Martins to take up the piano and practise much harder. Six years later, he gave his first concert at the Carnegie Hall, which was the most ________ moment of his life. He performed in concerts for years before he had to quit because of the unbearable ________ in his hands caused by too much ________.

Martins, in his forties, became a politician. However, he couldn’t stand this ________, so once again, he went back to the piano. All was going well until something unexpected ________ while leaving a concert. He ________ a serious brain injury and lost all the movement in his right hand. Again, with great ________ he played just with his left hand. Years later he lost the use of the left hand and ________ himself a conductor. Now, in his late seventies, Martins is still taking ________ to work and has conducted over a thousand concerts.

6 . When it comes to my fathering lessons, few adventures compare to the motorcycle trips I’ve shared with my daughter, Ewa.

Our first_______, in August 2017, was a winding (蜿蜒的) ride around the Catskills and Finger Lake districts of New York state. We _______ big highways and spent the week on_______ scenic back roads. At one point, I found myself _______along a Catskills meadow (草地) not far from Woodstock, keeping pace with a deer and shouting, “Go Bambi, go!”

On our second day, we _______ in a small town for ice cream. I asked the woman at the picnic table next to us: “What’s the_______ of this town?” “Interlaken,” she answered.“Where are you trying to get to?”

Me: “We don’t know. ”

It _______ to me then that I’d always wanted to do this no-schedule kind of trip, when you ride just for riding. Ask any middle-aged _______: We’ve all dreamed about doing the Easy Rider (逍遥骑士) thing, throwing our wristwatches into the ditch and heading toward the horizon without a_______. Now, travelling with no plan became a________ of my rides with Ewa.

Since we almost ________ knew where we were going, we were almost never ________ when we arrived, pulling ________ the road at the end of each day with satisfaction. The reason to celebrate? We________! The truth is that life on a motorbike is one close call (死里逃生) after another. On the way, riders must stay ________ 100 percent of the time. A tiny stone can be deadly. I used to be nervous, but Ewa had a different take: “To me, motorcycling is like meditation(冥想). ”

8 . This 3-mile stretch of sand and tide pools beneath a castle of 80-foot cliffs is a California tourism poster if there ever was one. Nothing disturbs the perfect, sunny view, except — once you’re aware of them — microplastic particles (颗粒). But you have to look close-on-your-hands-and-knees close-to see one. And once you do, you see another and another — so many that you may not think of this, or any beach, the same way again. These tiny preproduction plastic balls that manufacturers (生产商) melt down to form everything have been escaping factories, container ships, trains, trucks — and public notice — for decades.

The 2- to 3-millimeter, multicolored balls are a subset (子集) of microplastic-plastic particles less than 5 millimeters in size. Microplastic particles accumulate where water takes them, and they’ve been found on shorelines of every continent.

Dr McReynolds is an environmental scientist who’s now joined a global movement studying their trail into the environment. Establishing a baseline count of the presence of microplastic particles — and, more broadly, any microplastics — is the focus of Dr McReynolds’ scientific study here. Charting the count, noting tide, current, and weather conditions will show if amounts are increasing, and perhaps at what rate and why. That knowledge, he says, can inform solutions to plastic pollution such as regulation of their use.

“What are you doing? Picking up trash?” asks a steady stream of beach walkers whenever Dr McReynolds’ crew walks onto the beach and sets up equipment. These are teachable moments for Dr McReynolds.

One recent morning he told some beach walkers how microplastic particles are believed to absorb toxic chemicals, and — because they resemble fish eggs — are eaten by fish and birds and enter the food chain. Almost right on time, a seagull hopped up to a plastic-coated photo of microplastic particles and hungrily pecked (啄食) at it.

Will his work help save the world? Dr McReynolds waves a finger at that idea, “I won’t ever use that word — I won’t save the world from this pollution problem. Preserve it, yes. We want to take care of it.”

9 . In today’s digital era, social media users are increasingly coming across fake news online. This leads to the pressing issue: What causes people to fall for misinformation on the Internet?

According to researchers at the Penn State College of Information Sciences and Technology,   users can easily fall into an echo chamber (回声室)—a sort of virtual space where users consume only one-sided news, eventually distrusting any opposing views. “We all tend to agree with the group opinion. Hence, people naturally get together with others who hold the same opinion,” said Dongwon Lee, one of the researchers. “But if you’re not cautious, there is a high risk of falling into an echo chamber.”

To prevent this phenomenon, the researchers have crafted a novel tool, a game named ChamberBreaker, to help players resist echo chambers and reduce the rate of fake news spread. The fundamental approach employed by ChamberBreaker centers around a decision-making procedure that mirrors the creation of echo chambers. In ChamberBreaker, a player is tasked with trying to have community members fall into an echo chamber. To begin, the player is randomly assigned a situation that focuses on a health, political or environmental issue, and is presented with six pieces of news on that topic. Then, the player selects news that could cause the other members to fall into an echo chamber while at the same time maintaining their trust. If successful, the community members will fall into an echo chamber and the player will witness the resulting negative effects on the community.

After developing ChamberBreaker, researchers tested it with over 800 subjects to see if it raised awareness of echo chambers and changed news consumption behaviors. The researchers found that those who played ChamberBreaker were significantly more likely to state their intention to observe online information from more diverse perspectives and showed an increased awareness of the echo chamber phenomenon.

Ultimately, the researchers hope that their methodology can excite a greater interest in the scientific and scholarly study related to information consumption. The application of tools like ChamberBreaker, which focuses on fostering analytical reasoning, may lead us towards a more informed online community.

10 . Metin Sitti at the Max Planck Institute for Intelligent Systems in Stuttgart, Germany, and his colleagues have developed tiny robots called “microrollers” that can carry cancer drugs and selectively target human breast cancer cells. The team drew inspiration for the design of the robots from white blood cells in the human body, which can move along the walls of blood vessels (血管) against the direction of blood flow.

The microrollers are round and made from glass microparticles. One half of the robot was coated with a thin magnetic nanofilm (磁性纳米膜) made from nickel and gold. The other half was coated with the cancer drug doxorubicin as well as molecules that recognize cancer cells.

The team tested the robots using mouse blood and artificial channels lined with human endothelial cells—the kind of cells that line the inner walls of our blood vessels. The robots were exposed to a mixture of cancerous and healthy tissue. The microrollers selectively attached to the cancer cells and were activated using UV light to release the doxorubicin.

By applying magnetic fields, the team was able to control the movement of the microrollers, both with and against the flow of blood. The microrollers can reach a speed of up to 600 micrometers per second. “If you come to a spot where you need to take the right path and if you miss it, then you could go back and go to the right one,” says Setti.

In future, the researchers want to use other methods to start the drug release, such as heat or near-infrared light. They also plan to try making microrollers out of materials that would break down in the body over a few weeks or months.

The team hopes to test the microrollers in animals soon. “The rollers need to carry enough cancer drugs, which is why we need to have them in large numbers,” says Setti. “But since we can locally take drugs to the right target, we don’t need huge dosages (剂量).”