4 . Researchers have developed a new soft robot design that conducts itself with three behaviours at the same time: rolling (翻滚) forward. turning like a record and following a path that goes around a central point. The equipment, which operates without human or computer control, holds promise for developing soft robots that can be used to AA-head and map unknown environments.

The new soft robots are called twisted ring-bots (扭曲环机器人) . They are made of something like the ribbon (缎带) and then joined together at the end to form a ring.

When the robots are placed on a surface that is at least 55 degrees Celsius, which is hotter than the surrounding air, one part of the ribbon touching the surface becomes smaller, while one part in the air does not. This induces a rolling movement: the warmer the surface, the faster the robot rolls. “The ribbon rolls on its horizontal axis (横轴) , giving the ring forward strength,” says Jie Yin, a professor of mechanical and aerospace engineering.

The twisted ring-bot also turns along its central axis. And as the twisted ring-bot moves forward it travels in a path around a central point, basically moving in a large circle. However, if the twisted ring-bot meets a boundary- like the wall of a box-it will travel along the boundary.

The twisted ring-bots are examples of equipment whose behaviour is governed by physical intelligence, meaning their actions are determined by their structural design and the materials they are made of, rather than being directed by a computer or human.

“Soft robotics is still a relatively new field.” Yin says. “Finding new ways to control the movement of soft robots in a repeatable and engineered way moves the field forward. And advancing our understanding of what is possible is exciting.”

5 . Four Places to Listen to Free Music Online

Pandora

Pandora is a popular Internet radio service that lets users create personalized stations and listen to music. To use Pandora, you will have to create an account using your email address and a password. As you find music you like, you can save songs to your collection. However, you can’t download any specific tracks to your computer or phone.

LiveOne

On LiveOne, you’ll mostly find big artists, bands and songs along with interviews and news. While you won’t be able to stream all songs on demand for free due to licensing restrictions (限制), you will be able to create a station of similar tracks/artists from nearly any song. There’s a tab (标签) named “My Library” where you can save and share your favourite music.

iHeartRadio

iHeartRadio is a great website or app for listening to live radio stations. You can find local stations or check out stations from around the country. You won’t have to create an account to begin listening on iHeartRadio. but you can make one for free to save stations and playlists. Whether you decide to create an account or not. you won’t be able to download music from iHeartRadio.

Spotify

If you’re looking for free music online, you’ve most likely come across Spotify already. This resource is great for streaming popular hits while discovering new favourites. You can keep track of what you’ve recently played, and “favourite” songs. In addition to music. Spotify offers playlists of its most-played songs and information on local upcoming concerts.

6 . The African continent has seen its average monthly temperatures rise by 0.5 — 2 degrees Celsius over the past century, with up to another two degrees of warming projected for the next 100 years. The changing climate will break historical rainfall patterns, but which of these, temperature or rainfall, will have the most impact on a species, like rhinos (犀牛) ?

“Generally speaking, most, if not all, species will. in one way or another, be affected by the changing climate,” says lead author Hlelowenkhosi S. Mamba, who completed this research. It is therefore important to catch tendency (趋势) and model futures for some of the world’s weakest species. It can help prepare to reduce climate change’s effects, hence reducing global biodiversity losses.

To understand how our changing climate will affect rhino populations, Mamba and Timothy Randhir, professor of environmental protection, focused their efforts on the five large national parks that are home to most of the rhinos.

Mamba and Randhir then modeled two scenes for each of the parks: the IPCC’s high-emissions (排放) scenes and a more moderate (适度的) emissions scenes. They projected temperature and rainfall for each of the scenes out to 2055 and 2085 to arrive at a possibility that each park would remain suitable for the rhinos.

Nearly every park will become increasingly drier as emissions increase. This is all very bad news for the rhinos, because the team also found that, though the change in rainfall will not be most suitable for the rhinos, the changes in temperature are greater than what the species can bear.

“The temperature conditions in all study parks will become increasingly unsuitable for the species. And under the high-emissions scenes, the possibility of occurrence of the species falls to zero by 2085,” the authors write.

But to be forewarned is to be prepared in advance. “We propose that park managers think now about increasing water supplies, tree cover, watching for stress and planning to allow rhinos to move from one place to another place as the world warms,” says Randhir.

8 . Wild African elephants may break sleep records for mammals (哺乳动物). New data show that they seem to survive on about two hours of shut-eye a night. Much of that sleeping took place while they were standing up. The animals lie down to sleep only once every three to four nights.

Trying to figure out how much wild elephants sleep just by watching them 24 hours a day is tricky, especially in the dark. Much of what scientists had known about sleeping elephants came from animals living in zoos, notes Paul Manger, who is a brain researcher at the University of the Witwatersrand in South Africa. In zoos, elephants have been recorded sleeping from about three hours to nearly seven during a 24-hour period. Using electronic monitors on African elephants in the wild, however, has turned up more extreme behavior.

Manger’s team implanted (植入) activity monitors in the trunks (象鼻) of two elephants. Both were female leaders of their herds in the Chobe National Park. Trunks, like human hands, are important for exploring the world. Elephants hardly keep them still — unless sleeping. The researchers thought that a trunk monitor that didn’t move for at least five minutes likely meant its host was asleep.

The monitors tracked the animals over about a month. During that time, the elephants averaged just two hours of sleep a day. What’s more, the elephants were able to skip a night’s sleep without needing extra rest the next day. Those trunk implants showed there were times when the elephants went up to 46 hours without any sleep.

There has been some thought that animals need sleep to store memories properly. But that can’t explain animals, like the elephants, which skip sleep for a night without needing catch-up rest later. “Elephants are usually not considered to be forgetful animals,” Manger observes. In fact, he notes, studies have found that they can have long memories.

9 . On April 8, as millions of people tried to watch a solar eclipse (日食) in North America, eye doctors across the United States would be ready to offer medical help.

That’s because, while a solar eclipse is an exciting event, it can also be dangerous. Looking at any part of the exposed sun without the right kind of protection can injure the eye’s light-sensitive retina (视网膜).

In 2017, during the solar eclipse seen across the United States, that happened to many people despite the media coverage about the danger of looking at the sun when it is anything less than fully and completely covered by the moon.

Given that more than 150 million people directly viewed either a partial eclipse or a total eclipse, however, the number of those who suffered eye problems may seem relatively small.

“We’ve got less than 100 cases across Canada and the US,” says Ralph Chou, an eclipse eye safety expert with the University of Waterloo in Canada. “But no one knows for sure how many people damaged their eyes in 2017,” he says, “because not every case gets written up for a medical journal, and people may not seek help for less serious eyesight troubles.”

“A lot of eyesight problems, if they actually happened, were probably relatively minor and, they disappeared on their own within weeks or months,” says Chou. “About half of those who experience significant eye problems on the day after an eclipse will recover almost completely.”

He notes that there are ways to enjoy the eclipse without looking up at all; everyday household objects allow you to create pinhole projectors (针孔投射) that let you watch an image of the sun. “If you do choose to look up at the sun when it is partially eclipsed,” says Chou, “make sure that you have the proper eclipse glasses.”

10 . This collection of annual events along the world’s coastlines is worth penciling in your diary.

Festa de Yemanjá, Brazil

It is an annual national party in the country’s oldest city of Salvador. Honouring the Afro-Brazilian Yoruban heritage and the history of the Bahia state capital, this cultural event sees street parades and performances as crowds are dressed in white. The food stands in the city give out fresh cakes to mark the occasion.

Biennale de Dakar, Senegal

Art takes centre stage in Dakar, the Senegalese capital, each summer season for the event. Founded in 1990, the event is the biggest and most exciting in the African art calendar. The energetic capital city makes an amazing backdrop for introducing African artists to a global audience and inviting international artists onto the streets of the city.

Printemps de la Sardine, France

The French town of Saint-Gilles-Croix-de-Vie on the Atlantic coast is recognized as the sardine (沙丁鱼) capital of the country. Here, the arrival of the little fish kickstarts the party that takes over the town each spring. From tastings and walking trails to sardine-focused menus at local restaurants and discussions about their role in literature, the two-week celebration lets the delicious local speciality become a focus.

Rock Oyster Festival, the UK

With musical performances from the likes of Nile Rodgers, Sophie Ellis-Bextor, Groove Armada and more, the three - day festival also showcases some of the best chefs and restaurants from around Cornwall as well as cooking demonstrations (展示) and masterclasses. Well-known chefs such as Olia Hercules and Andi Oliver share their stories, while over at Mussel Beach, there’s a celebration of live fire cooking.