“Keep out or I'll chase you out! This is my property!” You hear this every spring. It is a long musical sound —a bird song! Birds use their songs to communicate different messages to one another. People who study bird sounds are learning their meanings.

    Usually it is the male that sings. Early in spring he sings to say that he has picked out a piece of property. He sings to attract a female of his same kind. Together they will raise a family in his territory (领地). He sings to tell all other birds of his kind to keep out.

    Each kind of bird has its own type of song. Cardinals sing something that sounds a little like “What cheer, cheer, cheer.” Towhees sing, “Drink your tea.”

    Most of the time, birds pay attention only to the songs of birds of their own kind. Cardinals answer cardinals, and song sparrows answer song sparrows. A cardinal knows that a song sparrow will not try to steal its mate. So you can see one reason why a cardinal may chase away another cardinal but will not bother a song sparrow.

    Most different kinds of birds eat different things. To find enough to eat, a bird needs a big piece of land to search in. Many kinds of birds have some ways of dividing up the land into territories. Song sparrows, cardinals ovenbirds, and white-throated sparrows are some of the birds that have territorial systems.

    Especially in early spring, birds work out the boundaries between their territories by singing “keep out” threats and by chasing and fighting each other. The birds continue singing to tell females that they have set up territories. Neighboring birds seem to agree that there are make believe fences between their pieces of property. Then they do not have to waste energy chasing each other instead of taking care of their young.

    Scientists guessed that some birds could recognize their neighbors by small differences in their songs. Two scientists who studied white-throated sparrows found that these birds can even tell the difference between songs of individual birds of their own kind. White-throated sparrows have songs that seem to say “I'm your neighbor” or “I'm a stranger” or “I'm your neighbor to the west.” Other kinds of birds could tell neighbors from strangers by their songs, too.

Adventure Works World Tours

    How often have you said out loud, “I would love to see the Eiffel Tower someday…” or “My dream in life is to see the pyramids”? Now you can stop talking about it and do it! Our mission is to provide you with the most comprehensive and complete planning and travel services so that you can have the adventure of a lifetime that is exciting, comfortable and worry-free.

    We have several packages to accommodate almost any need, or you can let us create a custom travel package. Following is a small sampling of some of our packages.

Egyptian nights

    Travel with us to the land of the pyramids, where you'll see ancient mysteries displayed before your eyes! Our specialists will share with you their extensive knowledge of Egyptian history and artifacts as you admire ancient wonders like the Sphinx and the pyramids at Giza.

    Packages range from 7 days and nights to 21 days and nights, and all packages include hotel, tours, and meals. Priced from $1,000 per person.

Splendors of Italy

    From the leaning tower at Pisa to the Vatican (梵蒂冈) in Rome, you'll see the greatest sights in Italy. You'll visit Florence, Rome, Pisa, and villages in the Italian countryside. You'll even get a primer (入门书) in the Italian language from a world-celebrated linguist (语言学家). Plus, you'll visit a cooking school for a lesson on how to make real Italian lasagna! Priced from $800 per person.

Russian experience

    Explore the best of Russia, a place of cultural and historical beauty. You'll tour Moscow and St. Petersburg and see for yourself places like Red Square, the Kremlin, Moscow University and more. Learn about the history and the people that make up this remarkable place. Priced from $1,500 per person (does not include airfare).

    Let us create just the right custom package for you! Let us show you the world!

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    As we know, earthquakes can bring people much fear. There are some places that have few or no earthquakes. Most places in the world, however, have them regularly. Countries that have a lot of earthquakes are usually quite mountainous.

    The most talked about earthquake in the United States was in San Francisco in 1906. Over 700 people died in it. The strongest one in North America was in 1964. It happened in Alaska.

    Strong earthquakes are not always the ones that kill the most people. In 1755, one of the strongest earthquakes ever recorded was felt in Portugal. Around 2,000 people died.

    In 1923, a very strong earthquake hit Tokyo, Yokohama area of Japan. A hundred and forty thousand people died. Most of them died in fires which followed the earthquake.

    One of the worst earthquakes ever was in China in 2008. It killed a large number of people. The worst earthquake ever reported was also in China, in which 400,000 people were killed or injured. This earthquake happened in 1556.

    Earthquakes worry people a lot. The reason is that we often do not know when they are coming. People cannot prepare for earthquakes.

    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.

About 50 feet from shore, two brothers were fighting for their lives, their mouths barely able to stay above the water. Thick fog made it difficult for beach goers to see the guys, but the screams were unmistakable and every second counted. The brothers, aged 15 and 20, were wearing shorts and T-shirts, unsuitable for a November day, let alone the 50-degree water. Keven Harder, a supervising ranger, told the North Coast Journal that swimming in such a temperature "will take the fight right out of you."

Luckily, four surfers in wet suits were nearby. Narayan Weibel, Spenser Stratton, and Adrian York, all 16, along with Taj Ortiz-beck, 15, were on their surf boards riding on waves when they heard the cries. They turned and saw two bobbing heads and four flailing arms. "We looked at each other and knew they were about to drown, " Weibel said.

Weibel, Stratton, and Ortiz-beck paddled toward the distressed swimmers while York headed to shore to call 911. As the surfers drew close, the brothers were struggling. "It was pretty stressful, but there wasn't any time to think about it," Ortiz-beck said. He pulled up alongside the younger brother. Grabbing him under his arms, he raised him up onto the board. Stratton and Weibel, meanwhile, were straining(竭力)to help the elder brother. He was large, about 250 pounds, and panicked. Fortunately, York arrived in time to help get the elder brother atop the second board. The surfers then paddled several minutes through rough water to the medical help waiting onshore. The brothers were scared but fine.

"When we get a call like this one, it's usually too late by the time we get there, " said Dillon Ceavenger, the first responder. "I can't say enough about what these boys did. They were willing and prepared to risk their lives."

A mix of anxiety rising in my chest and a voice at the back of my mind shouting ‘what's wrong with me?'-it's how I've felt about rejection my whole life.

 The earliest rejection I can remember was on my first day of school. I started the term late due to illness and the teacher asked the class who would play with me at break. The silence was deafening. Now, a bit of online dating sees us rejected by half the town before we've even started our day. There's not a break at work. Is there a worse feeling than hitting the final slide on your presentation, boldly asking 'any questions?' and looking around the room to see everyone on their phones?

We need to build resilience. For me, this has come in two stages. First, I spent time listening to the voice of fear that saw each rejection as proof that there was something wrong with me. When I analysed it, I could see it was rarely about me. Perhaps the guy I was talking to was too busy to reply. It was likely that the magazine I'd sent a passage to already had an article on that topic. Now, I assume it's about me 20 per cent of the time-and I can live with that.

 The other thing I do is practice rejecting. Because I hate rejection, I shy away from being the rejector, which means I either please people or avoid tricky situations. Instead, I've come up with a few lines for when I want to say no: 'That sounds great but it's not for me; thank you for asking but I decline; it was lovely but I think we should leave it there.' It's never pleasant to reject a person but there is a kind way to do it. With resilience and clarity, we can see the plus sides of rejection: it frees us up to do something else, be with someone else and be happier. We can't complain about that.