Note：

* All under 18's must be accompanied by an adult

* Pets allowed: No

* Cost: Free

* Phone: 01674­830736

* Location: SNH Visitor Centre, St Cyrus National Nature Reserve

    Many people feel stressed out about buying and giving gifts around holidays．But have the holidays become too materialistic and more about the gifts than the feelings behind them?

    Throughout the world，many cultures mark holidays with gifts and food．Holiday traditions bring people together and allow us to feel a part of family and community．The gifts and food that we share are all about expressing a sense of appreciation and joy．The gifts of a few generations ago were probably more common and homemade．Even the people who could afford expensive presents probably didn't do as much buying and spending as we do today．

    But with our culture growing more commercial，sometimes the original meaning behind the tradition gets lost．Not only is the pressure on spending money on the right present，but many people also find that when gifts become the focus of a holiday，it puts too much emphasis on receiving．It's too easy to have high expectations of what's in that beautifully wrapped box—and that can set anyone up for disappointment．No wonder we often hear about people having the“holiday blues”—feeling sad or empty．

    Not all people think the holidays are too materialistic，of course．Most appreciate the traditional aspects of the holidays．And some love shopping and are just fine with all the giving and receiving．But if you're feeling a little empty about the holidays，what can you do? One key to a relaxing and meaningful holiday is finding what works best for you，both in terms of gift giving and other holiday traditions．Putting some thought into what the holidays mean to you and then focusing your energies on those aspects that leave you feeling most satisfied can help you let go of the stuff that may be stressing you out．

    The surface of Venus（金星）has never seemed very hospitable. Temperatures change around 470℃（900℉）, the result of a runway greenhouse effect，and the pressure of its atmosphere, thick with carbon dioxide and sulfuric acid, is some 90 times that of Earth's. Lead（铅）would flow like water on Venus, and water cannot have existed in liquid form for perhaps a billion years.

    Now NASA'S Magellan spacecraft seems to have found one more horror in the nasty landscape: active volcanoes. Last week the space agency released the first detailed map of Venus and the most dramatic images ever made of its surface. The picture offer the best evidence to date that a planet once assumed dead is actually a lively pot of geological change.

    The most amazing image is of Venus's second tallest mountain, Maat Mons, which rises 8km（5 miles）. Most of the planet's many peaks, including 9.5-km-（6-mile-） high Maxwell Montes, look bright in the radar pictures Magellan takes from its orbit above the permanent could cover. That means they are strong reflectors of radar waves. But Maat Mons is dark; like the Stealth bomber, it absorbs much of the radar falling on it.

    This interesting fact, say project scientists, is a strong hint that the mountains has recently been covered with lava. Rock that sits on the surface of mountaintops appears to weather quickly in the hot，chemically reactive atmosphere, creating a soil that is rich in iron sulfide（硫化铁）• It is this mineral, the scientists believe, that can easily be seen on radar. If Maat Mons doesn't have any, it has probably been resurfaced, perhaps within the past few years.

    Such resurfacing has undoubtedly taken place in Venus lowlands: earlier images of the planet showed vast areas that are remarkably free of craters（火山坑）.That would be easy to explain on a Planet like Earth, where cratering from meteor strikes is erased by steady erosion. But while there is some evidence of wind erosion on Venus, the best explanation for the lack of cratering is periodic lava flow. Magellan has found direct evidence of such flows, including domelike upwellings and hardened streamed of rock trailing down the sides of Venusian peaks. There are also signs of other geologic activities, including dramatic faulting and several distinct incidents of mountain building. But the evidence can't indicate whether they really occurred millions of years ago. The case for active Venusian volcanoes is not yet proved, but Magellan, which is now well into its second complete survey of the planet's surface, may eventually settle the issue.

    Looking out the window of his truck, Bob Fitzgerald sees large, undesirable plants growing in the fields. Visitors to his neighborhood around the Chesapeake Bay mainly see dying forests and empty farmland. Fitzgerald says the land has been in his family since the 17th century, and it has been sinking for hundreds of years. As sea levels rise salt water is entering rivers and other waterways. As a result, the ground is becoming too salty for crops to grow.

    Around the world, scientists warn that coastal (沿海 ) farms are under threat from rising seas and salt water. A World Bank report predicts that rice production in coastal areas may fall by 15 percent by the year 2050. Another study found that hundreds of millions of people will be forced to move inland because of rising waters.

    Kate Tully, an agroecologist(农业生态学家) wants to keep coastal farmers in business as the seas rise. The United States Department of Agriculture gave Tully and other researchers $ 1.1 million to study the problem. She and her team hope to give farmers ways to stay on their land. She told media that they are testing different crops on pieces of land around the coastal areas.

    "Sorghum is my new favorite crop because it can grow without rain and it can grow with lots of rain. So this is actually a pretty good option." The grain crop may be a good choice to feed the nearly 600 million chickens raised in the area each year. As farmers know, chickens can deal with salt, dry weather conditions and heavy rains. Tally's group is also testing other kinds of grain and a few crops that they believe can grow in the salt.

    Yet just being able to grow a crop is not enough. The crop has to be profitable. So an economist on the team will be looking at the numbers. But continuing to farm the land may not be the best plan of action. Some people believe the land should he given back to nature. They say the fields should be turned into wetlands, which are popular with duck hunters. "There's money in duck hunting," fully said. Hunting organizations will pay farmers for a permit to hunt on their land. Farmers could earn a lot of money from duck hunters, she said.

    Tully and her team are just getting started. It will be a few years before they really understand how to save the farms.

    A good disguise keeps you hidden, right? Well, sometimes the best disguise is actually the most dazzling because research reveals that flashy metallic iridescence(金属彩虹色) can visually puzzle predators, which allows colorful prey to survive another day. Those surprising results appear in the journal Scientific Reports.

    Shining iridescent color, which changes depending on the angle from which it's viewed, is favored by everything from birds to beetles and blossoms to butterflies.

    "And in our research group we are of course interested in why this vivid metallic color is so widespread in nature." Karin Kjernsmo of the University of Bristol adds that in some cases the showy splashes of light are a sexual strategy. " Here I would like to point out that in some species, particularly those that display strong sexual dimorphism(雌雄两性), such as birds of paradise or some butterflies or fishes, the occurrence of iridescence is most likely driven by sexual selection. For example, in many of these cases it is the males that have these vivid iridescent colors and they use them in mate choice or they use them as a signal to attract mates."  But iridescence also shows up in situations where reproduction is not an issue. " So what we are studying now is whether natural selection imposed by predation(捕食行为) could explain the occurrence of iridescence in prey animals."

    The idea that eye­catching colors could be used as a cover­up isn't a new one." The father of camouflage theory, Abbott Thayer, really believed that iridescence should be categorized as a camouflage strategy. And he wrote in his famous lifework Concealing­Coloration in the Animal Kingdom, already in 1909, that 'brilliantly changeable or metallic colors are among the strongest factors in an animal's concealment'. And this sounds like a completely unreasonable thing to say, because how can colors that are both brilliant and changeable contribute to animal's concealment？"

    "In a similar way, we were asking whether iridescence, due to its changeability, could work as a form of camouflage by preventing shape recognition." Kjernsmo and her colleagues trained bumblebees to associate a particular shape—a circle or an oval—with a sugar reward. And they found that the bees, when given a choice, would preferentially visit the shape they knew to be sweet. But when the shapes were iridescent, the bees had trouble telling them apart. "It seemed that the strikingly iridescent surfaces on our targets visually broke up the otherwise recognizable shape of the targets, which made them hard to distinguish." As for making use of this method for hiding in plain sight, "Any practical applications is of course directly linked to any industry that has an interest in camouflage, that is how to conceal objects or make them more difficult to recognize." The researchers are currently conducting experiments with birds, which often prey on iridescent insects to see if it helps to have a bird's­eye view.

    Fantasy as a genre is often unfairly wronged. While there are plenty of authors who seem to be paid by the word and are only concerned with expanding volume, there are many authors producing fantastic works that are worthy of the word literature. While there were many worthy competitors, here are what we consider to be the great work of the greatest fantasy series of all time.

    ①The Dark Tower by Stephen King

    The Dark Tower actually shares some similarities with The Wheel of Time. In both series the first four books are the strongest, and you also get the sense with both Robert Jordan and Stephen King that they didn't quite know how to end their creation, which led to a very controversial ending in The Dark Tower's case along with some questionable decisions by King like his self-insertion in the story.

    King has created one of the most iconic fantasy characters of all time in the Gunslinger Roland and the world he creates, with all of its similarities to our reality, is a prosperous one. It's too bad that Stephen King doesn't dabble(涉猎) more in fantasy, because he clearly has a talent for world building. Not to mention everything he writes seems to be phone book sized, which would fit right in with the fantasy genre.

    ②Harry Potter by J.K. Rowling

    When considering a ranking of the greatest fantasy series of all time, the question of Harry Potter is a tricky one. There's inevitably opposition when something is as popular as Rowling's work, and add to that the fact that the series is seemingly meant for children and you have a case that naturally inspires a lot of debate. I'm not sure I believe Rowling did anything particularly new with Harry Potter, but a work doesn't necessarily have to be innovative for it to be great. Nearly every fantasy series owes a debt to Tolkien for instance, but that doesn't mean Tolkien has written the only work of fantasy that matters. Rowling didn't really come up with anything new, but the connection she made with tens of millions of readers is praiseworthy. People will be reading Harry Potter for decades to come, and I'm not sure a better introduction to fantasy could be found.