Every people uses its own special word to show its ideas and feelings. Some of these expressions（表达，说法） are commonly used for many years. Others are popular for just a short time. One such American expression is “Where's the beef?” It is used when something is not as good as it is said to be. In the early 1980s “Where's the beef?” was one of the most popular expressions in the United States. It seemed as if everyone using it at the time.

    Beef, of course, is the meat from a cow, and food is more popular in America than a hamburger made from beef. In the 1960s a businessman named Ray began building small restaurants that sold hamburgers at a low price. Ray called this “McDonald's”. Ray became one of the richest businessmen at last in America.

    Other business people watched his success. Some of them opened their own hamburger restaurants. One company called “Wendy's” said its hamburgers were bigger than those sold by McDonald's or anyone else. The Wendy's Company began to use the expression “Where's the beef?” to make people know that Wendy's hamburgers were the biggest. The Wendy's television advertisement showed three old women eating hamburgers. The bread that covered the meat was very big, but inside there was only a bit of meat. One of the women said she would not eat a hamburger with such a little piece of beef. “Where's the beef?” she shouted in a funny way. The advertisement for Wendy's hamburger restaurants was success. As we said, it seemed everyone began using the expression “Where's the beef?”.

    Peyto Lake, Canada

    Located in Banff National Park. Canada's first national park Peyto Lake is one of the most wonderful lakes in the world. What makes it truly beautiful is its unique greenish-blue color, and placement in the Canadian Rockies. Named after trail guide Bill Peyto, this lake is located at a height of 1,860m.

    Entry Details: $9.80 adult, $8.30 senior, $4.90 youth, and $19.60 family.

    Best Time to Visit: July, August, and September

    Lake Argentino, Argentina

    Located in the Patagonian province in Argentina, the lake is truly beautiful. Surrounded by glaciers and snow-covered mountains, the lake presents visual delights like none other. With a maximum depth of 500 meters, it's the biggest freshwater lake in Argentina. The lake is famous for fishing.

    Entry Details: $15~$20, changes as per season, but entry for tourists above 70 years of age is always free.

    Best Time to Visit: December to March, and late November

    Lake Baikal, Russia

    Being the world's oldest and deepest lake, Baikal is about 395 meters long, 49 meters wide and 1,637meters deep. It holds more water than the Five Great Lakes of America combined, and is thus the largest freshwater lake globally. Located in the south Russian region of Siberia, a trip to view this lake is a trip of a lifetime!

    Entry Details: No Entrance fee here

    Best Time to Visit; March to April

    Lake Como, Italy

    Considered one of the most beautiful lakes in Europe, Lake Como has attracted tourists since Roman times. Located in Lombardy, Como is one of the deepest lakes in Europe. Surrounded by vil1as and palaces, this lake has attracted some of the wealthiest. Today, many celebrities(名人) have houses here. Here you can enjoy water sports, take a flight over the lake, or try skiing during the winters-every tourist has something he's going to like!

Entry Details: Free

    Best Time to Visit: July and September

    A new keyboard can tell whether you are its owner. The keyboard records information about the typing pattern and sends it to a computer program. The program then checks to see if the pattern matches the right user. If not, an alarm sounds, and the computer locks the typist out. It locks out anyone else, even if the person knows password. What's more, this device needs no batteries. It harvests all the energy it needs from the action of your typing. Besides, the keyboard is also self-cleaning and the keys are free of damage from water, oil and dirt.

    The keys of the new keyboard are made of the same inexpensive plastic that might be found on any other standard keyboard. But instead of being smooth, the keys have millions of tiny plastic nanowires (纳米线) on their surface area to every key, increasing the effective contact area between the plastics and fingers. This ensures that there's enough power to run the keyboard as someone types.

    Liming Dai, a scientist, did not work on the new keyboard, but he thinks the design could be important in getting better performance from a variety of devices. “It could also be applied to a touch screen, for instance,” Dai says. “Then smart phones and notepads could harvest energy from the action of someone typing or drawing.”

    “Future work might make the keyboard even more useful,” Dai adds. “A later design might build tiny capacitors(电容器) onto the nanowires,” he suggests. Capacitors are little devices that temporarily store electric charges. Those might then LEDs to light a Keyboard in the dark.

    Zhonglin Wang is a co-designer of the new keyboard. His team has build a working model of the keyboard. “If a company decides to fund(投资) its production, this keyboard could be in stores in as little as two years,” says Wang.

    Saber Miresmailli was on vacation in London when, caught in a bit of traffic on London Bridge, he decided to take a photo of Tower Bridge.

    “I noticed the couple,” he said. “At that moment, I did not see anyone from the wedding party or a photographer with the couple, so I took several pictures. Usually, my pictures are not very good given the fact that I don't use flash and I don't stop to compose (构图)-so when we get back after two weeks, I was very surprised to find this one turned out so well.”

    Miresmailli said, “I thought to myself, if it was me getting married, I would have wanted the picture.” So he posted the photo on Facebook and attached a few friends with the hope of finding the couple and passing them the picture. What happened next, he said, “was crazy”. “I received more than 2,000 requests from perfect strangers and lots of positive and negative emails.” Until this afternoon, almost 230,000 people had shared his Facebook post on the photo.

There's also been an uncertain identification of the couple. It's likely that their names are Laura and James. “If it's the right couple,” Miresmailli said, “they are on their honeymoon in Bali and have no idea about the photo. I believe they will be shocked to find out about their fame.”

    Miresmailli said he's been drowned by the interest in the photo. “I just want to give them their picture and go back to work and tend my tomatoes,” he said.

Foreign visitors to the UK might be disappointed when they learn that not everyone there speaks like Harry Potter and his friends. Usually, there's an assumption by many non-Brits that everyone in Britain speaks with what's known as a Received Pronunciation (RP, 标准发音) accent, also called "the Queen's English". However, while many people do talk this way, most Britons speak in their own regional accents.

    Scouse, Glaswegian and Black Country – from Liverpool, Glasgow and the West Midlands – are just three of the countless non-RP accents that British people speak with. There are even differences in accents between towns or cities just 30 kilometers apart. What is even more disappointing is that not speaking in a RP accent may mean a British person is judged and even treated differently in their everyday life.

    In a 2015 study by The University of South Wales, videos of people reading a passage in three different UK accents were shown to a second group of people. The group then rated how intelligent they thought the readers sounded. The lowest-rated accent was Brummie, native to people from Birmingham, a city whose accent is considered working class.

    However, there is no need to be disappointed though you are not speaking in an RP accent. In fact, doing the opposite may even give you strength.

Kong Seong-jae, 25, is an internet celebrity from Seoul. After studying in the UK, he picked up several regional accents. He's now famous for his online videos, where he shows off the various accents he's learned. "British people usually get really excited when I use some of their local dialect words, and they become much friendlier. I think it makes a bit of bond between local people and foreigners to speak in their local accent," he said.

    So if you're working on perfecting your British accent, try to speak like someone from Liverpool, Glasgow or Birmingham. You may not sound like Harry Potter, but you are likely to make more friends.

    Many non-edible (不能吃的), poisonous or otherwise not pleasant-tasting butterflies have distinct colors and pat terns. As a result, other more palatable (可口的)butterflies have evolved to mimic (模仿)those patterns to avoid being consumed by predators. There are several types of mimicry in butterflies: Bayesian mimicry, Müllerian mimicry, wasp (黄蜂)mimicry and tiger complex mimicry. Birds will con­sume unpalatable butterflies and associate their colors and patterns with the negative experience, thus avoiding the but­terflies performing mimicry. It is possible that birds even communicate their experience with other birds.

    Bayesian mimicry was established by the naturalist Hen­ry Walter Bates in 1862. He first observed that mimicry involved a palatable butterfly resembling an unpalatable, often toxic (有毒的)，butterfly. This mimicry will only work when the toxic model species outnumbers the non-toxic spe­cies. He believed that mimicry was the result of edible but­terflies producing mutations (突变)making them resemble their inedible cousins. This in turn resulted in the increased survival of the butterflies containing the mutation and resul­ted in the similarities between species. In 1879 another naturalist, Johann Friedrich Theodor Müller, observed that in some cases of mimicry both the mimic and the model are un­palatable. He considered this to be a cooperative mimicry and believed the species evolved side by side in a mutually benefi­cial relationship. If a bird tried to eat a member of either spe­cies, it would then avoid both. Wasp mimicry is similar to Bayesian mimicry, but instead of mimicking another unpalata­ble butterfly species, the mimic resembles a wasp to avoid predators.

    The tiger complex is a group of around 200 species of Neotropical butterflies that are involved in the most well-known form of mimicry. It is named such because the patterns of all of the included species are black on a background of either orange or yellow, resembling a tiger. In the com­plex are many unpalatable species, a few toxic species and a large number of completely edible species. Members of the tiger complex are all known for congregating (集合)in large groups that would normally be easy food for birds. Fortunately, birds have no interest in them due to their mimicry.