An absolute description of the threat hanging over the world's mammals,reptiles,amphibians and other life forms has been published by the well-known scientific journal,Nature.A special analysis carried out by the journal indicates that an astonishing 41% of all amphibians on the planet now face extinction while 26% of mammal species and 13% of birds are similarly threatened.

    Many species are already critically endangered and close to extinction,including the Sumatran elephant,Amur leopard and mountain gorilla.But also in danger of vanishing（消失）for the wild,it now appears,are animals that are currently rated as merely being endangered.

    In each case,the finger of blame points directly at human activities.The continuing spread of agriculture is destroying millions of hectares of wild habitats every year,leaving animals without homes,while the introduction of newly-come species,often helped by humans,is also damaging native populations.At the same time,pollution and overfishing are destroying ocean ecosystems.

    "Habitat destruction,pollution or overfishing either kill off wild creatures and plants or leaves them badly weakened," said Derek Tittensor,an ocean ecologist at the World Conservation Monitoring Centre in Cambridge. "The trouble is that in coming decades,the additional threat of worsening climate change will become more and more common and could then kill off these survivors."

    The problem,according to Nature,is worsened because of the huge gaps in scientists knowledge about the planet's biodiversity.Evaluations of the total number of species of animals and plants alive vary from 2 million to 50 million.In addition,evaluations of current rates of species' disappearances vary from 500 to 36,000 a year. "That is the real problem we face," added Tittensor. "The scale of uncertainty is huge."

    In the end,however,the data indicate that the world is heading cruelly towards a mass extinction-which is defined as one involving a loss of 75% of species or more.This could arrive in less than a hundred years or could take a thousand,depending on extinction rates.

    Have you ever felt a sudden feeling of joy because you heard a favorite song playing? Then you know that music can have a strong effect on your emotions.{#blank#}1{#/blank#}It can help get you out of a bad mood (心情) or stay in a good one, says Alicia Ann Clair, professor at the University of Kansas. {#blank#}2{#/blank#}

    To cheer up, listen to Latin music or anything with a strong beat or a fast speed {#blank#}3{#/blank#} When you want to relax after a busy day, music with a slower speed can calm you down.

    Listen to calming music before you start any stressful activities, advises Dr. Clair. "Once you' re in a good state of mind, it' s easier to keep it." You can lower stress at work with music, too, by playing relaxing tunes (曲调).{#blank#}4{#/blank#}"If you listen to them all day long, you' 11 stop noticing them," Dr. Clair explains. Then the music won't have any effect.

    {#blank#}5{#/blank#}"To feel energetic, start with something relaxing, and then gradually increase the speed and beat," says Dr. Clair. For example, first play some nice slow love songs, and then listen to something more energetic. When you want to calm down after a busy week at work, just do the opposite.

A. Music can also help you relax and feel active.

B. Try to take advantage of this power of music.

C. But only play them when you really need them.

D. Loud and fast music can fill you with energy.

E. There are different kinds of music around the world.

F. Put on your favorite song, but only if it is one that can lift your spirits.

G. You can change your mood by changing from one kind of music to another.

    Camp Bestival is a British music festival. It is held annually, in July, at Lulworth Castle in Dorset and is targeted at families with small children. It can hold 30,000 people. It won the Best New Festival award from the UK Festival Awards in 2008 and the Best Family Festival in 2009, 2010, 2013 and 2014.

Camp Bestival has a variety of activities-and entertainment throughout the festival, including comedy shows, literature programmes, a kids area, workshops and performances.

    Food stalls (摊位) and tents are available all over the festival site.

Camp Bestival 2015 Weekend Ticket Prices:

    Adult Weekend Ticket-£195

    Student Weekend Ticket-£180

    Age 15 to 17 Weekend Ticket-£113

    Age 11 to 14 Weekend Ticket-£88

    Age 5 to 10 Weekend Ticket-£20

    Age 4 & Under Weekend Ticket-FREE

    General Terms and Conditions:

    Weekend Ticket holders (Thursday arrivals): Car parks open at 10 am and the campsites open at midday on Thursday 30th July.

    Weekend Ticket holders (Friday arrivals): Car parks open at 7 am and the campsites open at 9 am on Friday 31st July.

    No entry to the site after midnight (each night). Campsites close at 2 pm on Monday 3rd August.

    You will not be allowed to bring in glass bottles of any kind. Broken glass is very dangerous for kids. Small stoves can be used to cook food but ONLY in allowed cooking areas.

    The Lulworth Castle site is a beautiful natural site and we want to keep it that way, so please help us by keeping it clean—Keep Bestival Tidy!

    The past two decades have seen astronomers' catalogue of planets expand over two hundred times, as new techniques and better telescopes have found more than 2,000 of them orbiting stars other than the sun. But in the solar system itself, the list of planets has actually shrunk, Pluto（冥王星）having been downgraded from that status in 2006. The number of the sun's planetary companions has thus fallen from nine to eight.

    Now, a pair of astronomers from the California Institute of Technology think they have evidence that will restore the sun's record to its previous value. Their analysis of objects orbiting in the Kuiper Belt（柯伊伯带）, a ring of frozen asteroids（小行星）that circle beyond the orbit of Neptune (and of which Pluto is now regarded as the largest member), suggests to them that something about ten times as massive as Earth has changed those orbits. If you knew where to look, this planet-sized object would be visible through a suitable telescope. And Konstanin Batygin and Michael Brown believe they do know.

As they write in the Astronomical journal, they have analyzed the orbits of Kuiper Belt objects and found six that behave in a peculiar way. As the diagram shows, the points of closest approach of these objects to the sun, known as their perihelia（近日点）, almost coincide. Moreover, these perihelia all lie near the ecliptic（黄道）—the plane of Earth's orbit and also, approximately, that of the other planets—while the objects' orbits are all angled at 30° below the ecliptic. The chance of all this being a coincidence, the two researchers estimate, is about seven in 100,000. If it is not a coincidence, it suggests the six objects have been guided into their orbits by the gravitational intervention of something much larger.

    A computer analysis Dr Batygin and Dr Brown performed suggests this something is a planet weighing 5-15 times as much as Earth, whose perihelion is on the opposite side of the sun from the cluster, and which thus orbits mainly on the other side of the solar system from the objects its orbit has affected. This planet's perihelion would be 200 times farther from the sun than Earth's, and the far end of its orbit might be as much as six times that distance away. This gives a search zone, and Dr Batygin and Dr Brown are using Subaru, a Japanese telescope, to perform that search.

    Given other demands on Subaru's time, it might take five years for this search to find (or not find) the hypothetical planet. But looking at some existing data from. The Widefield Infrared Survey Explore, a satellite, might also show it, if it is there to be seen.

    Ironically, it was Dr Brown as much as anyone who was responsible for Pluto's downgrading, for he discovered Eris, an object almost as big as Pluto, in 2005.

    That discovery did much to damage Pluto's planetary proof. By his own admission, he was skeptical that the anomalies he and Dr Batygin have investigated actually would point to the existence of a replacement ninth planet. He is a skeptic no longer. Whether he is actually right may soon become apparent.

    Hungary's capital sparkles(闪耀)in winter and it's a great place to see in the New Year. There's festive cheer on tap, with concerts, folk dancing and stalls selling wine or fruit brandy and traditional chimney cake outsides. New Year's Eve is celebrated with fireworks over the Danube(多瑙河), and it's worth booking one of the many river cruises(巡游)with dinner and DJs (free and open 24/7, but likely to be crowded).

    A four-night trip with Travel Republic costs £449 for a family (2 adults with 1 child under 6), departing Stansted on 28 December with Ryanair, with B&B accommodation at the central Atrium Budapest Hotel.

    For a slightly more cerebral(理智的)New Year's Eve, Stockholm is a smart choice. The main celebration is at Skansen, Sweden's oldest open-air museum. Enterainment starts at 8 p.m. with singing and dancing, and peaks with a recitation of the poem Ring Out. Evening tickets are £14 for adults (children under 6 go free), or there are new day and evening combination tickets (£16 adult/£5 child). On New Year's Day, early birds can try an introduction to ice skating (8 a.m. daily, £139).

    Book it Ryanair, Norwegian and SAS fly to Stockholm from several UK airports.

    The land of fire and ice lives up to its name on New Year's Eve, when about 90 bonfires(篝火)are lit across the country. Some bonfires are accompanied by Icelandic singing; most start about 8 p.m. and finish by 10 p.m., which can be a good time to see the northern lights. After the fires, everyone goes home to watch Áramótaskaup, a TV show that has been running on 31 December since 1966. But that doesn't mean the party is over just before midnight, they all come back out to let off an astonishing amount of fireworks, with profits going to Icelandic Search and Rescue Association, which does life-saving work, and is run by volunteers and is a cause close to most Icelanders' hearts.

    Book it Wow Air and Wizz Air, easyJet and Icelandair fly to Reykjavik from several UK cities.

Time Travel

    If you could travel in time, where would you go? Perhaps you would watch an original performance of a Shakespeare's play in Elizabethan England? What about hanging out with Laozi in the Spring and Autumn Period? Or maybe you'd voyage far ahead of the present day to see what the future holds.

    The possibility of time travel is indeed appealing. Stories exploring the subject have been around for hundreds of years. Perhaps the best known example is science fiction novel. The Time Machine, which was written by H.G. Wells and published in 1895 for the first time. It was adapted into at least two feature films of the same name, as well as two television versions, and a large number of comic book adaptations. It is generally credited with the popularization of the concept of time travel using a vehicle that allows an operator to travel purposefully and selectively. The term "time machine", coined by Wells, is now universally used to refer to a vehicle transporting people into the far future.

    But could time travel actually be possible? Some scientists say yes, in theory. They propose using cracks in time and space called “wormholes”, which could be used as shortcuts to other periods. Einstein's theory of relativity allows time travel in extreme circumstances. And British physicist Stephen Hawking says you could travel into the future with a really fast spaceship going at nearly the speed of light. Though building such a spaceship would of course be no simple task.

    Even if you could travel into the past, there is something called the “grandfather paradox”. It asks what would happen if a time traveler were to go back in time and have his own grandfather killed for some reason, and therefore prevent himself from being born. If the time traveler wasn't born, how would he travel back in time?

    And would you really like to visit the future? In H.G. Wells' book, the main character travels into distant time where he arrives at a beach and is attacked by giant crabs. He then voyages 30 million years into the future where the only living thing is a black object with tentacles(触角).

    If that's what's in store, maybe we are better just living in the present day after all.