Most people agree that honesty is a goodthing. But does Mother Nature agree? Animals can't talk, but can they lie in other ways? Can they lie with their bodies and behavior? Animal experts may not call it lying, but they do agree that many animals, from birds to chimpanzees, behave dishonestly to fool other animals. Why? Dishonesty often helps them survive.

    Many kinds of birds are very successful at fooling other animals. For example, a bird called the plover sometimes pretends to be hurt in order to protect its young. When a predator（猎食动物）gets close to its nest, the plover leads the predator away from the nest. How? It pretends to have a broken wing. The predator follows the "hurt" adult, leaving the baby birds safe in the nest.

    Another kind of bird, the scrub jay, buries its food so it always has something to eat. Scrub jays are also thieves.They watch where others bury their food and steal it. But clever scrub jays seem to know when a thief is watching them. So they go back later, unbury the food, and bury it again somewhere else.

    Birds called cuckoos have found a way to have babies without doing much work. How? They don't make nests（鸟巢）. Instead, they get into other birds' nests secretly. Then they lay their eggs and fly away. When the baby birds come out, their adoptive parents feed them.

    Chimpanzees, or chimps, can also be sneaky. After a fight, the losing chimp will give its hand to the other. When the winning chimp puts out its hand, too, the chimps are friendly again. But an animal expert once saw a losing chimp take the winner's hand and start fighting again.

    Chimps are sneaky in other ways, too. When chimps find food that they love, such as bananas, it is natural for them to cry out. Then other chimps come running. But some clever chimps learn to cryvery softly when they find food. That way, other chimps don't hear them,  and they don't need to share their food.

    As children, many of us learn the saying "You can't fool Mother Nature." But maybe you can't trust her,either.

    Sometimes it's necessary to take a break, relax and forget the routine (日常工作), so I know of an excellent place to do it outside the city. It's a beautiful place and I really enjoy going there.

    The name is Tepoztlán, 71 km south of Mexico City. Here you can find a lot of different meals, beautiful landscapes, historical buildings, local souvenirs, and so on.

    The weather most of the time is very hot, and I have to give you some advice if you go.

    I give you this advice because I ended up with sunstroke. I'm going to tell you how my trip started. When we got there we were really starving, so we decided to have breakfast and when we go to Tepoztlan we usually enjoy "quesadillas" in the market.

    In Mexico, it's very common to eat in the market, but these kinds of markets not only sell food but also you can buy clothes, flowers, everything you can imagine.

    Tepoztlan has a lot of tourist sites, but the main attraction is Tepozteco hill, and it's more attractive for the visitors during "Spring Equinox". To be honest, I've never climbed it, I'm too lazy to walk a lot and even more in the sun.

    In my trip we didn't have time to do all that because one day is not enough, but if you have the opportunity to stay for more than one day it's an excellent idea.

    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.

    Dogs were living as companions to the early settlers of North America over 10,000 years ago. The oldest domestic dogs in the Americas were thought to be around 9500 years old. Angela Perri of Durham University, UK, and her colleagues have carried out fresh radiocarbon dating on the two dog skeletons that gave this date, discovered in the prehistoric Koster site in Illinois, and found they were even older: around 10,100 years old.

    A third dog from another Illinois site called Stilwell II was older still, at 10,190 years old. That makes it the oldest known domesticated dog in the Americas. The team concluded that all three dogs were domesticated as they skeletons were complete and unskinned, and so hadn't been butchered for food. They had also been carefully buried, evidence they were valued by their owners. The Stilwell II dog, which probably resembled a small English settler, was under what seemed to be the floor of a living area. It is unclear why it took so long for tame dogs to arrive in the Americas, given that they were domesticated at least 14,000 years ago in Eurasia. By this time, people were already moving into North America from Siberia; there is evidence some reached Chile 18,500 years ago. Geneticists have found signs of at least three waves of migration over the following millennia. There is no evidence that domestic dogs accompanied them. “We don't know if dogs were part of the first waves of immigration to the Americas" says Luc Janssens of Ghent University in Belgium. "It could be so, but no archaeological bones have yet been found." It is "overwhelmingly probable" that some of the early settlers did bring dogs to the Americas, but they may not have had "the time or the spiritual compulsion to bury them", says Pat Shipman of Pennsylvania State University.

    “Mayday! We got Mayday!” Frank Pisano screamed over the microphone to the air control tower at the airport. One of the two engines on his plane had failed, and he was now going down towards one of the busiest highways in America—Interstate 405, just south of Los Angeles—and there was no stopping it.

    Driving south on the 405, near the airport's runway, was John Meffert, a fire department captain. He was heading home from his shift when suddenly a low—flying plane caught his eye. After he took a second glance, a thought crossed his mind：“This plane's going to hit me.”

    He was right. The plane slammed into the road, popped up a few feet, and then clipped the front of Meffert's car. It finally stopped after hitting the divider(隔栏). Meffert pulled over. He was unhurt, and his car had received only a large scratch, so he turned his attention to the plane. He ran towards the smoke, and then he saw Frank's wife, Janan Pisano, pop her head up on the passenger side.

    By the time Meffert reached the aircraft, part of it was on fire and Janan, who was covered in blood, was on the wing trying to pull her husband from the wreck. Meffert, afraid the plane would explode, guided her to safety behind it. Then, he ran back for Frank, who had been knocked out by the initial crash, lying across both seats.

    Meffert carefully positioned himself under the pilot's arms and lifted him from the cockpit. Then he dragged the pilot off the wing and carried him to safety, where they could see the plane in flames.

    The Pisanos spent three weeks in the hospital. Remarkably, Meffert's car was the only one hit by the plane. Had Meffert been a second or two faster, Frank said, the left propeller(螺旋桨))would have ripped the top off his car and killed him.

    “I play all the what-ifs—going slower, going faster. It could have been a very different result,” Meffert said. “We just had a lot of angels.”

    I took down the violin I made in the past two months, and walked towards the farmland outside. The violin shined in the sunlight, and I admitted, unwillingly, that it looked good. But I knew it was a mockery (笑柄) of my failure to find beauty.

    “What makes a violin beautiful?”

    I first asked this question as a three-year-old child and now again as a teenager. When I listened to a violin for the first time, I was so astonished by its beauty that I imagined a fairy living in the wooden frame. But fairies faded when I grew older. I wanted a reasonable answer to the question.

    I referred to Professor Ruan, my violin teacher, who introduced the violin to me 14 years ago. This 85-year-old man rhapsodized about (热烈赞美)the legend of Antonio Stradivari. “His violins are the most beautiful works human has ever crafted.” “Make a violin with your own hands," Professor Ruan suggested, "When you play it, you'll know.”

    However, when Professor Ruan introduced to me a violin workshop, what I saw was far from my expectation. In front of me was a fat worker, shirtless and sunburned, soon to become my master. What shocked me most was that the “master” knew nearly nothing about music. His rough hands had been tending crops, not instruments, for most of his life.

Two months later, standing outside the workshop, I was disappointed. Yes, I just finished or copied a Stradivarius violin. But I didn't find beauty in it. Then I remembered Professor Ruan's words, "When you play it, you'll know.” So I closed my eyes, and focused on where my fingers and strings touched. Music flowed suddenly so beautifully that for a moment I doubted my own ears. Slowly I opened my eyes, and with surprise found the fairy of my childhood fantasy dancing to my music — the two-year-old daughter of the master.

    Professor Ruan was right. I didn't find beauty until I played music with the violin, because beauty isn't in the instrument itself. It's just here, deep down, in ourselves.