Your next Saturday night takeaway could be brought to you by a robot after a major food delivery company announced plans to use automated vehicles to transport meals. Europe's biggest online takeaway food company Just Eat has partnered with Starship Technologies to deliver food with robots on the streets of London later this month. “Nobody has ever done deliveries with land-based robots,” said Allan Martinson, the chief operating officer of Starship.

    The robot courier can travel up to 4 miles per hour for about 10 miles. It uses a GPS signal and nine cameras to navigate (确定方向). Instead of a person arriving at their door, customers could find themselves receiving a notification (通知) on their phone that says a robot is on its way and a code to unlock the automated courier. “Put the code in, the robot opens up, and there's your food,” said David Buttress, chief manager of Just Eat.

    The robot, which has so far been tested in Greenwich, Milton Keynes and Glastonbury, costs ￡1 to transport within 3 miles, compared with the ￡3 to ￡6 it costs for a human courier. To date 30 robots have driven nearly 5,000 miles without getting into an accident or finding themselves picked on by passers-by. They have driven in more than 40 cities around the world, including London and Tallinn, Estonia.

    An initial worry was how the public would react to robots. But Martinson said the public has been calm when passing the delivery machine on the streets. “The most surprising reaction has been the lack of reaction,” said Martinson.

    Another significant fear was that people would disrupt (扰乱) the robots, or try to steal them and their contents. To prevent this, the robot is fitted with nine cameras, two way audio, and movement sensors that send a warning if it is lifted off the ground. And it opens only with a pass code provided to the customer via a notification. “It's much easier to shoplift than it is to steal a robot,” said Martinson.

    Nikola Tesla

    Long overshadowed in public memory by his one-time employer, Thomas Edison, Tesla (1856—1943) was a brilliant scientist and engineer who earned more than 700 patents. He is most famous for developing alternating current (交流电), but his work also led to advances in wireless communications, lasers, X-rays, radar, lighting, robotics, and much more.

    Tesla was born to Serbian parents in what is now Croatia, but he emigrated(移民) to the U.S. as a young man, where he eventually became a naturalized citizen. Besides Edison, who later became his bitter rival, Tesla often worked with inventor George Westinghouse. In 1893, the pair demonstrated their advances in lighting and motors in the "White City" at the Chicago World's Fair. In 1895, Tesla and Westinghouse developed the world's first hydroelectric power plant, at Niagara Falls.

    At the turn of the century, Tesla set up a laboratory called Wardenclyffe in the small community of Shoreham, Long Island, where he conducted some of his most ambitious experiments. The building was financed by J. P. Morgan and designed by acclaimed architect Stanford White.

    The most prominent feature was Wardenclyffe Tower, also called Tesla Tower, a 187-foot-tall metal lattice tower topped with a big antenna that was intended to beam communications and even energy across the Atlantic.Tesla ran out of money while building the tower and was foreclosed(取消赎回权) on twice. As with his previous Colorado Springs lab, assets were sold to pay up his debts. In 1917, the U.S. government blew up the tower, fearing that German spies were using it in World War I. The metal was sold for scrap. For decades, the building was used for photo processing.

    "The tower is long gone, but the three-quarter-length statue of Tesla unveiled last week is a fitting memorial," said Alcorn, a retired teacher. "This is the last remaining Tesla laboratory anywhere in the world," she said. "He inspires those who work hard but don't get recognition, and people are starting to recognize how important his contributions are."

    As a sign of that growing appreciation, Elon Musk's start-up electric car company Tesla Motors was named after the visionary inventor in 2003.

    London's newest skyscraper(摩天大楼)is called the Shard and it cost about 430 million pounds to build. At a height of almost 310 meters, it is the tallest building in Europe. The Shard has completely changed the appearance of London. However, not everyone thinks that it is a change for the better.

    The Shard was designed by the famous Italian architect Renzo Piano. When he began designing the Shard for London, Piano wanted a very tall building that looked like a spire(尖顶). The sides of the building aren't regular. So the building has an unusual shape. And that is how the building got the name：the Shard. Piano says that the spire shape of the Shard is part of a great London tradition. The shape reminds him of the spires of the churches of London or the tall masts(桅杆)of the ships that were once on the river Thames.

    The Shard has 87 floors. At the moment the building is empty, but finally there will be a five-star hotel. There will also be top quality restaurants, apartments and offices.

    Before building work began, a lot of people didn't want the Shard though the plans were approved. Now they are still unhappy about the Shard. Some critics say that such a tall skyscraper might be good in a city like New York, but not in London. They say that the best thing about the Shard is its shape. But that is the only thing. There is no decoration, only flat surfaces. The Egyptians(埃及人)did that 4, 500 years ago.

    Other critics don't like what the Shard seems to represent. They say that the Shard shows how London is becoming more unequal. Only very rich people can afford to buy the expensive apartments and stay in the hotel. But the people living near the Shard are among the poorest in London. So the Shard seems a symbol of the division(分化)in society between the very rich and the poor.

    The Shard now dominates the London skyline. It is not certain, however, that ordinary London citizens will ever accept it as a valuable addition to the city.

    Scientists have found an unexpected use for virtual reality headsets (耳机). The devices (装置), widely used by computer gamers, show pictures that can be used to test the navigational (导航的) skills of people, who were thought to be at risk of dementia (痴呆). Those who do worse in the tests will be the ones more likely to develop Alzheimer's disease later in life, scientists now believe.

    The discovery that the loss of navigational skills was associated with Alzheimer's was made several years ago by Dennis Chan and his colleagues based at several centers in the UK. These studies used computers to test navigational tasks. But now scientists plan to take their tests to a new level with the use of the virtual reality headsets in which wearers are placed in man-made environments through which they must navigate.

    Around 300 people, aged between 40 and 60, will be arranged to participate in the study. Some will have a gene that puts them at risk of the condition or will come from a family with a history of Alzheimer's. Not all will certainly be affected by the disease, however. Chan's project aims to find out who will. Wearing the headsets, participants will be asked to navigate their way through a series of different environments and then remember the details.

    Researchers recently pointed out the significance of a tiny area of the brain known as the entorhinal cortex (an important memory center in the brain). It acts as a center in a widespread brain network that controls navigation. This now appears to be the first part of the brain that seems to be easily harmed by Alzheimer's.

    The goal of the work is to help people as they develop the disease. "So far, drug trials for Alzheimer's have been applied when people have already got dementia, by which time considerable damage to the brain has already occurred," Chan told the Obsenver. "If we can develop drugs and use them earlier, for example, before the disease has spread beyong the entorhinal cortex, then this would have the potential to prevent the dementia."

    Dave Merry and his tools have been through a lot together. The tools helped Dave, now 80, repair his home in St. Paul, Minnesota, where he and his wife, Annette Merry, lived for 46 years and raised three children. The table saw, the jointer plane, the drill press, and the dozens of other power and hand tools had pride of place in his carefully organized workshop. "I had a whole setup, and it was beautiful," says Dave, a retired engineer.

    But then Annette experienced a stroke (中风) that left her relying on a walker to get around, and the Merrys decided to move into assisted living. Dave's workshop was obviously a minor consideration given Annette's condition, but the family knew that giving it up, on top of everything else, would hurt.

    It was the Merrys' daughter who came up with a possible solution. She'd heard about some people who were setting up a tool library—a nonprofit facility that would lend out tools just as a regular library lends books. Might Dad be interested in donating his?

    "I said yes," Dave says.

    The people creating the St. Paul Tool Library were thrilled. They had expected it would take a year to collect enough tools to make their facility fully functional. Instead it took one day: the day Dave donated his.

    The library's founders drove over to the Merrys' house and picked everything up themselves. The library is housed in the basement of the American Can Factory. Members pay an annual fee (from $20 to $120) for unlimited tool use and a varying number of visits to the workshop. And they get an extra benefit: Dave Merry. "Almost every time we're open, Dave's here," says one of the founders, Peter Hoh. "It means a lot to me to be able to go and use my tools," Dave says. "But it means just as much to help DIYers use the tools properly."

    As Hoh puts it, "This is his workshop now."

A Dream Chaser in a Wheelchair

    Since the age of three, Chelsie Hill had dreamed of becoming a dancer. That ambition nearly ended in 2010 when Hill was in a car accident, which put the 17- year-old high school senior in hospital for 51 days and left her paralyzed from the waist down. For most people, that would have destroyed any hope of a dancing career. But for Hill, it was the beginning. Far from being a barrier, her wheelchair encouraged her to fight. "I want to prove to everyone including myself that I'm still normal," she said, "whatever normal means."

    Normal for her meant dancing, so Hill did it in her wheelchair alongside her nondisabled high school dance team. Half of her body was taken away from her, so she had to move it with her hands. It took much learning and patience.

    After graduation from high school, Hill wanted to expand her dance network to include women like her. She met people online who were fighting for the dream of dancing against various spinal(脊椎的)injuries, and invited them to dance with her. To reach more people in a larger city, Hill moved to Los Angeles in 2014 and formed a team of dancers with disabilities she called the Rollettes.

    Every year Hill holds a dance camp called the Rollettes Experience for wheelchair users to help them bring out their acting talent. In 2019, 173 participants from ten countries attended. For many, it was the first time they'd felt they belonged. Edna Serrano said that being part of the Rollettes team gave her the courage to get behind the wheel of a car. "I didn't know I could do so many things that my fellow teammates had taught me." she said. "I didn't know I could be sexy. It's so powerful to have my teammates in my life, because they're my teachers. I have more confidence."

    Chelsie Hill attained what many of us never will: her childhood dream. She has been chasing her dream in the wheelchair. She's a dancer. The Rollettes have helped her find something else just as fulfilling.