A team of engineers at Harvard University has been inspired by Nature to create the first robotic fly. The mechanical fly has become a platform for a series of new high-tech integrated systems. Designed to do what a fly does naturally, the tiny machine is the size of a fat housefly. Its mini wings allow it to stay in the air and perform controlled flight tasks.

    “It's extremely important for us to think about this as a whole system and not just the sum of a bunch of individual components (元件),” said Robert Wood, the Harvard engineering professor who has been working on the robotic fly project for over a decade. A few years ago, his team got the go-ahead to start piecing together the components.“The added difficulty with a project like this is that actually none of those components are off the shelf and so we have to develop them all on our own,” he said.

    They engineered a series of systems to start and drive the robotic fly. “The seemingly simple system which just moves the wings has a number of interdependencies on the individual components, each of which individually has to perform well, but then has to be matched well to everything it's connected to,” said Wood. The flight device was built into a set of power, computation, sensing and control systems. Wood says the success of the project proves that the flying robot with these tiny components can be built and manufactured.

    While this first robotic flyer is linked to a small, off-board power source, the goal is eventually to equip it with a built-in power source, so that it might someday perform data-gathering work at rescue sites, in farmers' fields or on the battlefield. “Basically it should be able to take off, land and fly around,” he said.

    Wood says the design offers a new way to study flight mechanics and control at insect-scale. Yet, the power, sensing and computation technologies on board could have much broader applications. “You can start thinking about using them to answer open scientific questions, you know, to study biology in ways that would be difficult with the animals, but using these robots instead,” he said. “So there are a lot of technologies and open interesting scientific questions that are really what drives us on a day to day basis.”

    Most nations have at least one type of food that people from other countries think is unusual or unacceptable to eat. In France, people eat horse meat and frog legs. In South Korea and parts of China, restaurants serve dog meat. And in Australia, it's common to cook kangaroo meat on the barbecue and use emu eggs to make pancakes.

    The kangaroo and emu are native to Australia. Both animals are important to the national image of Australia and appear on the Australian coat of arms. They're also central figures in the history of the native Australians. However, they still hunt these animals for their meat, fur and fat.

    Today, Australian people continue to eat these animals. One of the reasons people eat kangaroo meat is that it's high in protein and low in fat, so eating kangaroo is a good option for anyone on a diet. It's also cheaper to eat kangaroo meat than other red meats. Because of this, a lot of university students choose to buy kangaroo meat. BBC News also reported that Australian scientists believe that eating kangaroo meat is good for the environment— kangaroos have different digestive systems than cows and sheep, meaning they produce less methane, the second biggest contributor to global warming.

    While emu meat is high in iron and vitamin C, most people don't think it tastes good. For this reason, they prefer emu eggs. One egg is large enough to make seven omelettes (煎蛋). And while ifs illegal to collect emu eggs from the wild, they can be bought from emu farms. Rather than cracking the beautiful dark shell, it's better to dry it by putting a small hole at each end and blowing. Afterwards, you can even carve a design into the eggshell.

    If you are in Dubai you may notice a robot police officer sharing the street with you. Your first thought might be, “Have I walked into a movie set？”

    The answer is no. That robot is Dubai's newest police officer. The robot has a touch screen instead of a gun. The robot will be employed mostly at shopping centers and other places popular with visitors.

    The robot's face has eyes but no mouth or nose. It stands 165 centimeters tall and weighs 100 kilograms. If the robot works well, Dubai says 25 percent of its police force could be robots by 2030. The robot cop(巡警) was officially presented at Dubai's Gulf Information and Security Expo and Conference in May.

    The police hope the robot will make life easier for the people of Dubai. Khalid Al Razooqi is Director General of Smart Services at the Dubai Police. He said the robot can help the public every day, and that “it won't ask for any sick leave”.

    The robot cannot make arrests (逮捕). But it can recognize faces and compare them to photographs on a criminal database. It can also sense emotions. People can use the robot's touch screen to do things like reporting a crime, paying fines and reporting lost or found things. They can also ask how to get somewhere. The robot can greet and shake hands with people. So far, the robot can speak Arabic and English. It soon will learn other languages such as Russian, Chinese, French and Spanish. In addition to having a touch screen, the robot has a camera that can live stream video to a police command center.

    Dubai has plans to add other kinds of robots to its police force. Within two years, the city plans to use a three meter tall robot that can run up to 80 kilometers an hour. The Dubai government says the machine would be the world's largest robot. A human police officer will be able to sit inside and control the robot. It will be able to lift heavy objects.

    The city also plans to use an egg shaped robot to control parking areas and give tickets to people who break traffic laws.

    Mention the word superhero, and the images that come to mind are of fictional characters like Spiderman, Wonder Woman, or Batman. However, photographer Josh Rossi has used his camera to show the world's real superheroes — young children who are battling severe diseases and disabilities.

    The event leading to the creative project began in 2016, when Rossi fulfilled his then three­year­old daughter's dream of becoming Wonder Woman. Thanks to the handmade costume and Rossi's impressive Photoshop skills, the photoshoot instantly became a hit.

    Since it was Wonder Woman that brought about the idea, Rossi decided to focus on the superheroes that will appear alongside her in the upcoming movie, Justice League. To make the photo shoot more meaningful to the kids, he matched each child with a superhero with whom they had the most in common.

    The first member of the real­life "Justice League" was Kayden Kinckle. The five­year­old uses prosthetics (假肢) to walk because both his legs had to be cut off due to a born disorder. To Rossi, Kayden's perfect superhero was Cyborg, who was a healthy boy before a terrible accident left him injured, forcing his father to keep him alive with robotic parts.

    Teagan Pettit was born with only half a heart and has already gone through three open­heart surgeries. According to Rossi, the nine­year­old fits the bill for Superman because they both have a weak heart. The fictional superhero grows weak when near Kryptonite (氪), while Teagen's half heart is too weak to control his body temperature. The photographer says, "Superman and Teagan both have hearts of steel!"

The Best American Cities for Live Music (Besides Nashville)

Nashville isn't the only city in the country with an amazing live -music site. Read on to discover other hot spots that should top your live -music bucket list.

Austin, Texas

With an official motto of "Live Music Capital of the World," it is easy to find more than 100 spots showcasing a wide variety of free live music performances. So make your way to Texas. Hang your cowboy hat and check out The Parish, The Elephant Room,etc. for a truly unforgettable Austin experience.

Minneapolis, Minnesota

Prince, Bob Dylan, Lizzo and Husker Du are just some of the great musicians who have called Minnesota their home. One of Prince's favorite clubs to visit was the Dakota Jazz Club. If your budget is tight, you'll be happy to know that Minneapolis is one of 11 affordable U. S. cities to add to your bucket list.

Asbury Park, New Jersey

Asbury Park has seen a major musical rebirth over the last decade. The Stone Pony has been one of the most popular rock sites in the world since opening its doors in 1974, with Jon Bon Jovi helping to put i ton the map.

Raleigh, North Carolina

With more than 80 live music spots, Raleigh is sure to satisfy any musical desire you have. If dinner and a show is your style, the Irregardless Cafe has been hosting live jazz, not to mention fresh-from-the- farm meals- nightly since 1975. But before you book your ticket, learn how to say "Raleigh" like a local.

Most children love being told about nursery rhymes. The most popular rhymes {#blank#}1{#/blank#} (list) here. Even elders love to hear these rhymes {#blank#}2{#/blank#} are sweet to our ears forever. These rhymes speak volumes about the interest {#blank#}3{#/blank#} (show) by the education department to ensure the children to speak out. 

The list is clearly not exhaustive but {#blank#}4{#/blank#} is believed that a good cross section of famous poems for children has been included. We have selected the most famous nursery rhymes for children. We have done our best {#blank#}5{#/blank#} (collect) all the nursery rhymes from all sources and add them here for your {#blank#}6{#/blank#} (refer). The addition of more and more rhymes is going on every day.  

These nursery rhymes for children {#blank#}7{#/blank#} (pass) over the years and because {#blank#}8{#/blank#} the short nature of the verse, they can {#blank#}9{#/blank#}(easy) be remembered by most children from a very early age. Analysis of these nursery rhymes will reflect the {#blank#}10{#/blank#} (history) background where these nursery rhymes were written.