Sensors for Houseplants

Over the past two years Jasmin Moeller, a 38-year-old in Germany, has been buying more houseplants, making her feel more comfortable.

Actually, the fact that people have spent much more time     1     at home has started a trend to bring more nature inside. In the UK, the latest     2     show that 2021 houseplant sales were 29% higher than in 2020. It is a similar picture in other countries, with sales of houseplants in the US rising by 18% last year, for instance.

Yet it is one thing to buy a houseplant and quite another to successfully look after it. Luckily, some     3     sensors for indoor plants may help those without professional skills in gardening. These devices, usually solar powered and connected wirelessly to a user’s smartphone, should be inserted into the soil next to the plants. Then, they show in real time the     4     of the plants.

A sensor made by German firm Greensens has approximately 5000 plant     5     on its app database. Like a traffic light system, the app uses red, yellow and green faces to     6     how plants are doing. For example, red reveals that the plant is dying, while green means it’s in perfect condition. Besides, users are regularly     7     of what they should do with plants.

Another app released by German business Fyta tells users how their plants are by analyzing the uploaded pictures of the plants. It also includes     8     content other apps rarely offer, such as cultural history of some plants, so users can learn more about their plants.

However, Botanist Silver Spence is worried that     9     on these sensors may affect users’ gardening skills negatively. And David Anglov recommends that amateurs try their best to establish their own     10     of what a plant needs in various situations through careful observation.

Back in Germany, Ms Moeller says she is sure that the sensors are helping her improve gardening skills.

2 . Otters, are cute, this no one can deny. They have big eyes, short and flat noses and claws (爪子) like tiny hands. They look even cuter when they wear hats and throw food balls into their mouths as if they were bar snacks, like Takechiyo, a pet otter in Japan. Documenting Takechiyo’s funny behavior has earned his owner nearly 230,000 followers on Instagram, a photo-sharing app.

Takechiyo’s fame reflects a craze across east and South-East Asia for keeping the cute creatures as pets. Enthusiasts in Japan visit cafés where they pay to hug them; Indonesian owners parade their pets around on leads or go swimming with them, then share their pictures online. But these enjoyable photos mask a trade that is doing a lot of damage. Even before they became fashionable companions for humans, Asia’s wild otters faced plenty of threats. Their habitats are disappearing. They have long been hunted for their coats, or killed by farmers who wish to prevent them consuming fishes. The pet trade, which began picking up in the early 2000s but appeared to speed up a few years ago, has made things worse. The numbers of wild Asian small-clawed otters and smooth-coated otters, two species that are in highest demand, have declined by at least 30% in the three decades to 2019.

The international agreement that governs trade in wildlife, known as CITES, now prohibits cross-border trade in these species. But laws banning ownership are often poorly implemented, as in Thailand, or full of holes, as in Indonesia. And the otter-keeping craze has been dramatically improved by the internet, says Vincent Nijman of Oxford Brookes University. In 2017 TRAFFIC, a British charity that monitors the wildlife trade, spent nearly five months looking at Facebook and other social-media sites in five South-East Asian countries. During that time, it found around 1,000 otters advertised for sale online.

In any case, otters do not even make particularly good pets. Every year the Jakarta Animal Aid Network, a charity in Indonesia’s capital, receives some ten otters from people who have struggled to look after them. Faizul Duha, the founder of an Indonesian otter-owners’ group, admits that his two animals emit a “very specific” (read: fishy) smell. They bite humans and chew on furniture. Their scream can be heard blocks away. And their cages need cleaning every two-to-three hours. That is how often they empty their bowels (肠道).

A massive fire tore through the main market in the city of Hargeisa in northern Somalia overnight, injuring about two dozen people and     1    (destroy) hundreds of businesses, officials have said.

Images     2    (post) on social media showed flames and huge clouds of smoke in the night sky over the city, the capital of the breakaway region of Somaliland. The cause of the blaze     3     devastated the sprawling Waheen market, the lifeblood of the city and home     4     an estimated 2,000 shops and stalls, is not yet known.

Officials said it started on Friday evening but was largely brought under control by dawn on Saturday, although some small areas were still burning.

“The town has never witnessed such a massive calamity,” Hargeisa’s mayor, Abdikarim Ahmed Mooge, told reporters at the scene. “This place was the economic centre of Hargeisa and     5     the firefighters’ best efforts made to contain the fire, the market is destroyed.” He said the blaze could have been brought under control before causing such extensive damage but that the firefighters’ attempt     6    (deny) due to access problems. The vast market is a crowded warren of shops and makeshift stalls, with no proper streets, only narrow pathways.

The Somaliland president, Muse Bihi Abdi, said during a visit to Waheen     7    about 28 people, nine of them women, were injured, but that so far no loss of life     8    (report). He said the government would be releasing one million dollars to help with the emergency response to the disaster.

Hargeisa chamber of commerce chairman Jamal Aideed said the loss of the market was immense     9     it accounted for 40% to 50% of the city’s economy.

“I have lost everything tonight, this fire was the biggest I have ever seen in my life,” said market trader Bashi Ali. “I had several businesses in the market and all of them burned to ashes.     10    we can learn from this disaster is to plan the market well,” he added.

4 . When Mexican scientist of the evolution of animal behavior, Laura Cuaya, moved to Hungary for her postdoctoral studies in Budapest, she brought her pet dog, Kun-kun, along for the ride. Cuaya couldn't help noticing how locals warmed to dogs. This prompted her naturally curious scientific mind to start asking questions. “Here people are talking all the time to Kun-kun, but I always wonder if Kun-kun can recognize that people in Budapest speak Hungarian, not Spanish?” So she set out to find an answer through a scientific study.

Cuaya and her colleagues decided to use brain images from MRI scanning to shed light on her hunch. They worked with dogs of various ages that had, until the experiment, only heard their owners speak just one of the two languages, Spanish or Hungarian. Not surprisingly, getting the dogs to happily take part in the experiment took some creative coaxing and animal training! The researchers first needed to teach Kun-kun and her 17 fellow participating dogs including a labradoodle, a golden retriever and Australian shepherds, to lie still in a brain scanner. Their pet parents were always present, and they could leave the scanner at any point.

The research team played children's book classic The Little Prince in both Spanish and Hungarian while scanning the dogs' brains with an MRI machine. They were looking for evidence that their brains reacted differently to a familiar and unfamiliar language. The researchers also played scrambled versions of the story to find out if dogs could distinguish between speech and non-speech.

The images reveal that dogs' brains show different patterns of activity for an unfamiliar language than for a familiar one — the first time anyone has proved, researchers say, that a non-human brain can distinguish between two languages. This means that the sounds and rhythms of a familiar language are accessible to non-humans.

Interestingly, the team also found that the brains of older dogs were more skilled at detecting speech “suggesting a role for the amount of language exposure”. They suggest that dogs have refined their ability to distinguish between human languages over the long process of domestication.

Norway is Teaching Travelers to Travel

After 15 people died during Easter in 1967, the Norwegian Trekking Association and the Red Cross announced their campaign ‘Welcome to the mountains, but be responsible’. Fjellvettreglene, the ‘mountain code’     1     encourages people to have a healthy and respectful relationship with nature, has since become a crucial part of Norwegian culture. It includes points such as bringing necessary equipment   to assist yourself and others,     2    (seek)shelter if necessary and feeling no shame in turning around.

Nationally, Norway     3     (experience) an 11% increase in tourism in the past decade. Trolltunga, a piece of rock,     4     (see) 1,800 visitors in one 2017 day alone. Why? Because people want the same picture they see on Instagram and Facebook. A lot don’t care     5     the experience of the hike. They just want proof that they did it.     6     this tourism boom is good for the economy, it has become a threat to   Norway’s natural environment.

    7    (use) toilet paper, abandoned bottles and plastic bags can be found littered all around Trolltunga. And with the high amount of people who come unprepared for such an active hike, Norway’s leading hiking group, Friluftsliv, also has called for regulations on the number of tourists hiking to Trolltunga. Lasse Heimdal, leader of the outdoor organization said, “On a busy day, you may have to wait in line for an hour and a half just     8    (get) a picture. To control this, we’d like to regulate     9     people can hike in a day. Starting hike times should also have regulations so people don’t start too late and find     10     trapped here.”

Wolves have a certain undeserved reputation: fierce, dangerous, good for hunting down deer and farmers’ livestock. However, wolves have a softer, more social side, one that has been embraced by a heart-warming new initiative.

In a bid to save some of Europe’s last wolves, scientists have explored the willingness of these supposedly fierce creatures to help others of their kind. Female wolves, the scientists have discovered, make excellent foster parents to wolf cubs that are not their own. The study, published in Zoo Biology, suggests that captive-bred wolf cubs(幼兽) could be placed with wild wolf families, boosting the wild population.

The gray wolf was once the world’s most widely distributed mammal, but it became extinct as a result of widespread habitat destruction and the deliberate killing of wolves suspected of preying on livestock. Fear and hatred of the wolf have since become culturally rooted, fuelled by myths, fables and stories.

       In Scandinavia, the gray wolf is endangered, the remaining population found by just five animals. As a result, European wolves are severely inbred and have little genetic variability（变异性）, making them vulnerable to threats, such as outbreaks of disease that they can’t adapt to quickly. So Inger Scharis and Mats Amundin of Linkoping University, in Sweden, started Europe’s first gray wolf-fostering program. They worked with wolves kept at seven zoos across Scandinavia. Eight wolf cubs between four and six days old were removed from their natural parents and placed with other wolf packs in other zoos. The foster mothers accepted the new cubs placed in their midst.

The welfare of the foster cubs and the wolves’ natural behavior were monitored using a system of surveillance cameras. The foster cubs had a similar growth rate as their step siblings in the recipient litter, as well as their biological siblings in the source litter. The foster cubs had a better overall survival rate, with 73% surviving until 33 weeks, than their biological siblings left behind, of which 63% survived. That rate of survival is similar to that seen in wild wolf cubs. Scientists believe that wolves can recognize their young, but this study suggests they can only do so once cubs are somewhere between three to seven weeks of age.

If captive-bred cubs can be placed with wild-living families, which already have cubs of a similar age, not only will they have a good chance of survival, but they could help dramatically increase the diversity of the wild population, say the researchers. Just like the wild wolves they would join, these foster cubs would need protection from hunting. Their arrival could help preserve the future of one of nature’s most iconic and polarizing animals.

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Clean Air Act

The air in modern homes and offices is pretty clean,but not as clean as it might be.Often it contains small amounts of volatile(挥发性的）,poisonous,organic compounds.Long-term    1     to these is a bad thing,so clearing them out of the air people breathe is widely accepted as     2    

Finding an effective way to do so has proved difficult.But Stuart Strand, Long Zhang and Ryan Routsong, of the University of Washington,in Seattle,think they have succeeded,As they report in Environmental Science and Technology, their method involves     3     a gene from a rabbit into a popular indoor plant nicknamed Devil's vine—a type of ivy hat is so called because it is    4     difficult to kill.

The idea of     5     plants to de- pollute   the atmosphere inside buildings has been around for decades-but has met with only qualified success. One experiment involving unmodified spider plants,for example,showed that they are indeed     6     of removing formaldhyde (甲醛) from the air.The     7     is that to make much of a difference in a space as large as a house would require turning most of the rooms into spider-plant forests.

Dr Strand, Dr Zhang and Mr Routsong thus sought something suitably transgenic ( 转 基 因 的),but that does not flower indoors. The plant they settled on was Devil's vine,     8     because of its toughness.With the help of a bacterium,they were able to ferry the rabbit version of the gene into the plant's chromosomes(染色 体),and thus to,engineer a type of Devil's vine able to produce an air-cleaning substance. To test the     9     of their idea, the researchers put their modified ivy to work inside greenhouses filled with air containing high levels of harmful substances.The plants performed well,reducing the harmful substances in air to     10    .

10 . For millions of years, Arctic sea ice has expanded and shrunk in a rhythmic dance with the summer sun. Humans evolved in this icy world, and civilization relied on it for climatic, ecological and political stability. But now the world comes ever closer to a future without ice. The National Snow and Ice Data Center reported that 2019’s minimum arctic sea ice extent was the second lowest on record. Arctic summers could become mostly ice-free in 30 years, and possibly sooner if current trends continue. As the northern sea ice declines, the world must unite to preserve what remains of the Arctic.

Although most people have never seen the sea ice, its effects are never far away. By reflecting sunlight, Arctic ice acts as Earth’s air conditioner. Once dark water replaces brilliant ice, Earth could warm substantially, equivalent to the warming caused by the additional release of a trillion tons of carbon dioxide (CO₂) into the atmosphere and declining sea ice threatens wildlife, from the polar bear to algae that grow beneath the sea ice, supporting the large amount of marine life.

To avoid the consequences the scientific community should advocate not just for lowering greenhouse gas emissions, but also for protecting the Arctic from exploitation. The Antarctic shows the way. In the 1950s, countries raced to claim the Antarctic continent for resources and military installations. Enter the scientists. The 1957-1958 International Geophysical Year brought together scientists from competing countries to study Antarctica, and countries temporarily suspended their territorial disputes (争议). In 1959, 12 countries signed the Antarctic Treaty to preserve the continent for peaceful scientific discovery rather than territorial and military gain.

Sixty years later, we must now save the Arctic. A new Marine Arctic Peace Sanctuary (MAPS) Treaty would protect the Arctic Ocean as a scientific preserve for peaceful purposes only. Similar to Antarctica, MAPS would prohibit resource exploitation, commercial fishing and shipping, and military exercises. So far, only 2 non-Arctic countries have signed MAPS; 97 more need to sign on to enact it into law. Scientists can help—just as they did for the Antarctic—by giving statements of support, asking scientific organizations to endorse (支持) the treaty, communicating the importance of protecting the arctic to the public and policy-makers, and above all, by convincing national leaders to sign the treaty. In particular, Arctic nations must agree that recognizing the arctic as an international preserve is better than fighting over it. In 2018, these countries successfully negotiated a 16-year moratorium on commercial fishing in the Arctic high seas, demonstrating that such agreements are possible.

Humans have only ever lived in a world topped by ice. Can we now work together to protect Arctic ecosystems, keep the northern peace, and allow the sea ice to return?