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.”

    Earlier this year, the social media website Facebook announced that it would work with several news organizations — including The New York Times, The Guardian, and the BBC — to place news stories directly into users' personal Facebook webpage.  Stories published using Facebook Instant will load more quickly and keep the style of the original publisher, who will keep all the advertising income the stories earn — at least for now. The deal shows how important social media has become to news organizations, and is a clear sign of how the world of news is changing — and has been for a while.

    When Google News began in 2002, many saw it as the death of the newspaper. It had no human editor. Instead Google used, and still uses, a secret computer program that selects and displays news stories according to the reader's personal interests. More recently, Associated Press and Yahoo! have been publishing computer-written articles. Both use special software to automatically produce stories about company financial results and sports reports — areas where the quality of writing is felt to be of secondary importance to the accuracy of the data.

    Should we be worried about such developments? I think we should. One concern is that facebook, Google and other social media websites see journalism as a sideline, a way of putting people in front of advertisements. It isn't their primary function — so if it stops making them lots of money, they're likely to stop doing it.

    There's also a concern that computer-written articles are not actually journalism at all, because what a human news team produces is actually quite complex. A well-written news story puts information in context, offers a voice to each side of an argument and brings the public new knowledge.

    Though economics and speed of delivery mean readers will probably choose a computer-written story over a carefully shaped article — at least for daily news — I don't think the computers will be writing any in-depth articles for a while yet.

    The best festivals in Europe

    Whether they're in the countryside or a post-industrial landscape, Europe's yearly festival calendar means new events, old favourites, crazy people and great charm.

    OFF Festival, Poland

    A small festival in Katowice in south-west Poland, OFF has, over the past 10 years, built an international audience thanks to a challenging and interesting mix of acts. This year's selection focuses on female artists: singer-songwriters Feist and PJ Harvey headline, while Swedish pop singer Anna von Hausswolff and classical composer turned electronic producer Anna Meredith are also on the bill. Meanwhile, the experimental poetry and performance project by Moor Mother will undoubtedly be an unmissable show.

    ·4~6 August, ￡55, off-festival.pl

    Melt, Germany

    What would Melt be without its “sleepless stage”--a non-stop music marathon that runs from Saturday morning to midday on Monday? The German festival for those who love an all-hours party takes place in Ferropolis, Gra fenhainichen. This year, the festival celebrates its 20th anniversary, bringing 20,000 people together. A party train from Cologne also serves as your weekend accommodation! A worthy summer alternative to a party weekend in Berlin.

    ·￡140,14~16 July, melt festival.de

    Primavera Sound, Portugal and Spain

    A festival that has rapidly grown to attract visitors from across Europe with its electronic music, guitar-led acts and plenty of sunshine, Primavera Sound takes place in Barcelona and, since 2012, also in Porto, under the name NOS Primavera Sound. The Barcelona edition takes place across six days with an abundance of DJs on call to keep people dancing, while the smaller, three-day Porto festival has Bicep, Nicholas Jaar and Richie Hawtin, who will be doing a closing on the Friday night.

    ·Barcelona 31 May~4 June, ￡195; Porto 8~10 June, ￡110, primaverasound.com

    Washington, D.C. Bicycle Tours

    Cherry Blossom Bike Tour in Washington, D.C.

    Duration: 3 hours

    This small group bike tour is a fantastic way to see a world-famous cherry trees with beautiful flowers of Washington, D.C. Your guide will provide a history lesson about the trees and the famous monuments where they blossom. Reserve your spot before availability—and the cherry blossoms—disappear!

    Washington Capital Monuments Bicycle Tour

    Duration: 3 hours (4 miles)

    Join a guided bike tour and view some of the most popular monuments in Washington, D.C. Explore the monuments and memorials on the National Mall as your guide shares unique facts and history at each stop. Guided tour includes bike, helmet, cookies and bottled water.

    Capital City Bike Tour In Washington, D.C.

    Duration: 3 hours

    Morning or afternoon, this bike tour is the perfect tour for D. C. newcomers and locals looking to experience Washington, D.C. in a healthy way with minimum effort. Knowledgeable guides will entertain you with the most interesting stories about Presidents, Congress, memorials, and parks. Comfortable bikes and a smooth tour route(路线) make cycling between the sites fun and relaxing.

    Washington Capital Sites at Night Bicycle Tour

    Duration: 3 hours(7miles)

    Join a small group bike tour for an evening of exploration in the heart of Washington, D.C. Get up close to the monuments and memorials as you bike the sites of Capitol Hill and the National Mall. Frequent stops are made for photo taking as your guide offers unique facts and history. Tour includes bike, helmet, and bottled water. All riders are equipped with reflective vests and safety lights.

    About 6 years ago, I was on a plane next to a woman. I was tired and wanted to take a nap. But before I could go into "ignore pattern", she tapped me on the shoulder to introduce herself.

    "Hi, my name is Helga!"

    We got to talking and eventually it came up that I had started an organization in high school called R.A.K.E.(Random Acts of Kindness, Etc.). As I described what we did, Helga got very serious and told me that she admired me for that. She told me a story about the last time she had flown. She was on the way to Arizona because she had gotten sudden news that her dad's health was on the decline. Later her father's physician called to inform her that her dad had rather suddenly passed away. For the 3-hour plane ride, she sat in silence around strangers.

    When she arrived at the airport in Arizona, she walked to the nearest wall, sat down, and cried. And here is the part I'll never forget about Helga's story. For 2 hours she sat and wept while thousands walked to and fro in the airport. Helga looked at me and said, "Houston, not a single person stopped and asked if I was okay that day." It was that day that I realized how much we need each other. It was that day I realized that kindness isn't normal.

    Kindness isn't normal. That has stuck with me all these years especially now. I work in schools nationwide speaking about sympathy, kindness, empathy (同理心) and love. I'm reminded all the time that, for many of us, kindness is not usually our default setting. We spend so much time worrying about our problems, our lives, our insecurities, getting to our flight so we walk by or ignore people in need of help.

    So, I've made it my mission to do my part in sharing stories with students, teachers, and parents about our need for character and sympathy. I'm always be on the lookout for the little opportunities that surround me every day to do something nice.

    Babies born in summer are more likely to become short-sighted in late life, a study has shown.

    As many as a quarter of all cases of short-sightedness are caused by too great an exposure to sunlight in the first weeks of life, say eye experts.

    They are advising all parents to put sunglasses on their babies during the first weeks.

    Scientists had already established that over-exposure to sunlight caused shortsightedness in animals.

    Researchers who compared the months in which babies were born with whether they needed glasses later on say the principle also applies to humans.

    A study of almost 300, 000 young adults-the largest of its kind-showed that those born in June and July had a 25 per cent greater chance of becoming severely short-sighted than those born in December or January.

    Research leader Professor Michael Belkin, of Tel Aviv University, said it was because prolonged illumination(光照) causes the eyeball to lengthen-causing short-sightedness.

    Hence the more light a newborn is exposed to, the more the eyeball lengthens and the worse the short-sightedness will be.

    The mechanism which lengthens the eyeball is associated with levels of melatonin(褪黑激素), a pigment (色素) which protects the skin against harmful rays of the sun.

    In young babies not enough melatonin is released as protection, meaning they are more vulnerable to sunburn and changes to eyeball shape.

    Sight expert Professor Daniel O'Leary, of Anglia Ruskin University in Cambridge, said "At the moment we don't know the precise cause of why light exposure affects sight, but the evidence seems to prove that it is one of the reasons for people becoming shortsighted."