While the U.S. is still debating about getting rid of the penny, Sweden is rapidly moving towards abolishing currency altogether. Though this may sound radical(过激的), it is a natural evolution in this digital society.

    Sweden, which was the first European country to introduce banknotes in 1661, has just been working harder to convince its residents that digital payments are a safer alternative to carrying cash.

Over the years, the idea has gained popularity with residents, especially the younger generation that is much more comfortable with technology. Today many banks don't even have ATMs and some have stopped handling cash altogether!

    Tickets to ride public buses in most Swedish cities can only be purchased via cell phones. Numerous businesses are also moving towards accepting only digital payments. Even the homeless that sell street paper to make ends meet have to start accepting this mode of payment!

But despite its growing popularity, some people don't like this radical idea. They include the homeless, elderly people as well as those living in rural areas who are still uncomfortable with mobile phones and computers. But the officials are confident that in the very near future, they will be able to convince everyone to move this safe and more cost-effective payment system.

    Sweden is not the only country trying to abolish paper currency and coins. The movement is rapidly gaining ground in Denmark and Finland as well. In 2014, Israel announced a three-step plan to go cashless and just last week the vendors(小贩)of a popular street in Sydney declared they would stop accepting currency from customers. Whether this phenomenon spreads remains to be seen. But one thing is for sure—With increasingly advanced payment systems being introduced every day, pulling out cash is rapidly becoming “uncool”.

    From July to October every year, about a quarter of the world's blue whales feed in the Pacific Ocean off the coast of California. But the whales currently face a major threat in their favorite feeding area. Ships carrying cargo (货物）sail in the same area at the same time. All too often, the whales' paths and the ships' travel lines overlap (重叠), and a ship will hit a whale.

    According to a new study, these ship strikes have become a serious threat to the overall population of the world's blue whales. Only about 10,000 of the creatures still exist worldwide. Blue whales are the largest known animals ever to live on Earth. Even so, if hit by a container ship, a blue whale will likely die from its injuries.

    In 2007 alone, large ships killed five blue whales in the waters off San Francisco and Los Angeles, California. The National Oceanic and Atmospheric Administration (NOAA) says that because there are so few whales already, losing three to five from the California whale population every year is a significant loss. “The estimated population of blue whales in this part of the Pacific is 2,500”, says Sean Hastings, a NOAA analyst. “So every whale counts toward this species moving off the endangered-species list.”

    Now, marine scientists must figure out how to protect the whales from the giant container ships. One very simple program is already under way in the Santa Barbara Channel, a waterway that separates mainland California from the nearby Channel Islands.

    The Channel Islands National Marine Sanctuary has asked large container ships passing through the area to voluntarily slow down. Sailing slower will allow the ships‟ crew (船员）more time to change course before hitting a whale.

    Several of the world's largest shipping lines are set to participate in the new program. For every ship that passes through the Santa Barbara Channel at or below the reduced speed of 12 knots (海里/小时）, the company that owns the ship will be paid $2,500.

    In 1941, science fiction writer Isaac Asimov stated the Three Laws of Robotics. These laws come from the world of science fiction, but the real world is catching up. A law firm gave Pittsburgh's Carnegie Mellon University $10 million to explore artificial intelligence. Peter Kalis, chairman of the law firm, K&L Gates, said the development of technology had led to questions that were never taken seriously before. What will happen when you make robots that are smart, independent thinkers and then try to limit their freedom?

    Researcher Kalis said, “One expert said we'll be at a point when we give an instruction to our robot to go to work in the morning and it turns around and says, 'I'd rather go to the beach.'” He said that one day we would want laws to keep our free-thinking robots from running wild.

    With the law firm's gift, the university will be able to explore problems now appearing within automated industries. “Take driverless cars for example,” Kalis said. “If there's an accident concerned with a driverless car, what policies do we have in place? What kind of insurance policies do they have?” In fact, people can take a ride in a driverless car in Pittsburgh where an American online transportation network company uses the city as a testing ground for the company's driverless cars.

    The problems go beyond self-driving cars and robots. Think about the next generation of smartphones, those chips fixed in televisions, computers, fridges, etc., and the ever-expanding collection of personal data being stored in the “cloud”. So can Asimov's Three Laws of Robotics be used in reality? Is it necessary to have a moral guideline that everyone can understand? Whatever it is, doing no harm should be the very first one.

    Every month we look at a different artist. We think Haroshi is super cool—he makes sculptures(雕塑) from skateboards.

    Haroshi is in his late 30s. He's a skateboarder but he also makes things from wood. He began skateboarding when he was 15 years old and he loved it. He used to skate every day. Now, if you know anything about skateboarding, you'll know that skateboards don't last forever because they break. But Haroshi didn't throw his out because he was fond of them. Over time he built up a big collection and at the same time he learnt about all the different types of skateboard. Surprisingly, not all skateboards are of the same shape and actually they are often built in different ways. By the time he was 25, he had an enormous collection of old skateboards.

    He decided he had to do something with them so he started to cut them up. As he was doing that, he noticed some interesting patterns in the wood. He then cut more and stuck them on top of each other. The first thing he created from the wood was a piece of jewelry. He created something new from something old.

    Nowadays, however, he is known for his extremely large 3D wooden sculptures. His ideas generally come from skateboarding culture, ranging from skateboarding cats to cool trainers, but also everyday topics such as hurting yourself, getting better, being crazy about something and of course, growing up. All skateboarders will understand these. Haroshi has made over 40 pieces and each piece takes a very long time. There is no doubt that he is very talented but he's had no formal art training. He taught himself.

    Haroshi held an exhibition in London last month and three of us from @teenattack went along. As we entered the first room, we saw a huge bird that covered one wall. It was absolutely enormous! There was also a sculpture called Ordinary life. It looked like a broken leg—a very common problem, of course. It's incredible to think that these sculptures are all made from broken skateboards. But there's something else that is really interesting about Haroshi's work.

    In the twelfth century a sculptor called Unkei placed a glass ball in each of his works to show the heart of the piece. Haroshi also places something inside his sculptures—a piece of broken skateboard. In this way, he gives his sculptures life. We think that is just awesome!

Plants may tell us when they're in trouble.Thirsty tomato and tobacco plants make clicking sounds,researchers have found.The sounds are ultrasonic (超声波的),meaning they are too high-pitched for human ears to hear.But when the sounds are transformed to lower pitches,they sound like popping bubbles (爆破的泡泡).Plants also make clicks when their stems (茎) are cut.

"It's not like the plants are screaming," says Lilach Hadany,an evolutionary biologist working at Tel Aviv University in Israel."Plants may not mean to make these noises.We've shown only that plants create informative sounds."

Hadany and her colleagues first heard the clicks when they set microphones next to plants on tables in a lab.The microphones caught some noises.But the researchers needed to make sure that the clicking was coming from the plants.So,the scientists placed plants inside soundproof boxes in the basement,far from the noise of the lab.There,microphones picked up ultrasonic pops from thirsty tomato plants.Though it was outside humans' hearing range,the clicking made by plants was about as loud as a normal conversation.

Cut tomato plants and dry or cut tobacco plants clicked,too.But plants that had enough water or hadn't been cut stayed mostly quiet.Wheat,corn and grapevines also made sounds when stressed out.

The researchers don't yet know why plants click.Bubbles forming and then popping inside plant tissues that transport water might make the noises.But however they happen,pops from crops could help farmers,the researchers suggest.Microphones,for example,could monitor fields or greenhouses to detect when plants need to be irrigated (灌溉).

Hadany wonders whether other plants and insects already tune into plant pops.Other studies have suggested that plants respond to sounds.And animals from pests (害虫),moths to mice can hear in the range of the ultrasonic clicks.Sounds made by plants could be heard from around five meters away.Hadany's team is now studying what the living things near the plants will do after hearing the sounds.

The internet, once only a tool for communication, has quickly become a gateway to countless gaming adventures. Online gaming, the born of this digital revolution, has reshaped the landscape of entertainment, offering players an absorbing escape into virtual world.

Before the internet age, gaming was a communal experience. However, it wasn't until the dawn of the internet that gaming truly underwent a revolution. The transformative power of the internet transcends geographical boundaries(边界), connecting gamers from every corner of the globe in a shared virtual playground. Online gaming is a cultural phenomenon that reflects the evolution of digital society. It becomes increasingly vital to look at its impact on individuals, communities. 

Today, online gaming has transformed into a huge industry. The options for online gaming are endless. This evolution has been fueled by advancements in technology.The rise of online gaming platforms has revolutionised the way we play, offering a large number of convenience factors that have carried its popularity forward to new heights. Gamers can instantly access a vast library of titles with just a few clicks. 

With the power of smartphones at our fingertips, gaming is no longer limited to consoles(操控台) and PCs. Online gaming agrees with the fast-paced lifestyles of modern-day enthusiasts. Mobile internet connectivity allows players to visit cyber space whenever and wherever they please. As the lines between the physical and digital worlds are not clear, online gaming stands as evidence of the incomparable convenience and accessibility afforded by the internet.

The internet has not only provide access for gaming but has also redefined gaming itself, promoting connections among community members, shaping identities. Yet, in the wonders of online gaming, we must proceed with caution and mindfulness. Let us raise self-awareness, setting healthy boundaries, and seeking support when needed, ensuring that everyone can enjoy the wonders of online gaming in a safe and welcoming environment.