The Greatest Navigational Journey

    In 1787 Captain Bligh was given command of “The Bounty”, a three-year-old merchant ship. His mission was to transport breadfruit plants from the island of Tahiti to the West Indies. We know the popular story of this voyage and the rebellion, in which Bligh has been presented as hard, violent and thoroughly unpleasant captain. However, there is quite a lot of evidence to suggest that this picture is far from being true. He seems to have been unusually thoughtful about the health and welfare of his men. For example he made sure that his crew got exercise, insisted on cleanliness on his ship, and adopted the practice of giving them a drink which prevented scurvy every day.

    When Captain Bligh arrived in Tahiti, it became clear that it would be some months before the breadfruit trees were ready to be taken to the West Indies. Instead of going off right away, he gave his crew extended shore leave. This may have been a mistake as many were unhappy about leaving when the time came. Finally, on the return journey the rebellion took place. The ship was under the command of the rebels and Captain Bligh had to leave in a small boat.

    Captain Bligh's achievement was to get to dry land successfully. It is one of the supreme examples of seamanship. Apart from Bligh there were 18 members of his crew sailing in an open boat about 23 feet long and 7 feet wide. They took with them 25 gallons of water, 150 pounds of bread and 30 pounds of pork. They had no guns or other weapons. The boat was so low in the water that it seemed likely to sink at any time. On one occasion Captain Bligh tried to land on an island to get more water. He and his men were attacked by hostile natives and one of the crew was killed. At this point Bligh decided to sail directly to the Dutch settlement on the island of Timor without stopping. The distance was about 4,000 miles. The voyage took about 42 days and he had no advanced navigational equipment. However, his skill and commitment proved equal to the task and amazingly no one else died. It was truly a remarkable achievement.

    Urban swans might be born with a daredevil gene that makes them less fearful of humans, compared with their rural colleagues.

    A study has found swans living in cities tend to be bolder and it is at least partly determined by a gene called DRD4. Birds with this gene could therefore be better adapted to settling in more populated areas, while more timid（胆怯的）swans would escape to less inhabited regions.

    It could help to explain why swans in public parks and on urban rivers have a reputation for being so aggressive towards humans - they are simply not afraid of us.

    Biologists from some universities in Australia, tracked and collected blood samples from black swans living in two wetlands near cities. One group of swans lived in a recreational urban park, while the other occupied a waste-water processing site out of town. The two areas were less than 20 miles apart. Later, from 2011 through 2013, the researchers started systematically scaring the swans at both sites. The researchers approached the birds and calculated how close they could get before they flew away. As expected, they noticed that while rural swans started flying away if a human was closer than 119 meters, the scientists could come as close to urban swans as 39 meters before taking off.

    Analyses of the blood samples, in fact, showed that 83 per cent of the less cautious swans presented the same genetic DRD4 variation（变异)while rural swans have different genetic makeups resulting in more wariness(谨慎，小心）.

The researchers conclude that swans with the bold variation of the gene might choose to live in urban environments, as they tend to be less bothered by human presence.

The Cost of Higher Education

    Individuals (个人) should pay for their higher education.

    In general, a university education is of huge and direct benefit to the individual. Whether they are majoring in geography, geometry or any other subject, graduates earn more than non-graduates. Meanwhile, social mobility is ever more dependent on having a degree. However, only some people have it. So the individual, not the taxpayers should pay for it. There are pressing calls on the resources (资源) of the government. Using taxpayers' money to help small number of people to earn high incomes in the future is not one of them.

    Full government funding (资助) is not very good for universities. Adam Smith worked in a Scottish university whose teachers lived off student fees. He knew and looked down upon 18th-century Oxford, the grand university having much glory, where the academics lived comfortably off the income received from the government. Guaranteed salaries, Smith argued, were the enemy of hard work and when the academics were lazy and incompetent, the students grew similarly lazy in a gradual way.

    If students have to pay for their education, I guess they not only work harder, but also demand more from their teachers and have a better grasp of the subjects. And their teachers have to keep them satisfied. If that means taking teaching seriously, and giving less time to their own research interests, that is surely something to celebrate.

    Many people believe that higher education should be free because it is good for the economy (经济). Many graduates clearly do contribute to national wealth, but so do all the businesses that invest (投资) and create jobs. If you believe that the government should be generous enough to pay for higher education because graduates are economically productive, you should also believe that the government should pay part of business costs. Anyone promising to create jobs should receive a gift of capital（资金） from the government to invest.

    Therefore, it is the individual, not the government who should pay for their university education.

    If a diver surfaces too quickly, he may suffer the bends. Nitrogen(氮) dissolved(溶解) in his blood is suddenly liberated by the reduction of pressure. The consequence, if the bubbles (气泡)accumulate in a joint, is sharp pain and a bent body—thus the name. If the bubbles form in his lungs or his brain, the consequence can be death.

    Other air-breathing animals also suffer this decompression(减压) sickness if they surface too fast: whales, for example. And so, long ago, did ichthyosaurs. That these ancient sea animals got the bends can be seen from their bones. If bubbles of nitrogen form inside the bone they can cut off its blood supply. This kills the cells in the bone, and consequently weakens it, sometimes to the point of collapse. Fossil (化石)bones that have caved in on themselves are thus a sign that the animal once had the bends.

    Bruce Rothschild of the University of Kansas knew all this when he began a study of ichthyosaur bones to find out how widespread the problem was in the past. What he particularly wanted to investigate was how ichthyosaurs adapted to the problem of decompression over the 150 million years. To this end, he and his colleagues traveled the world's natural-history museums, looking at hundreds of ichthyosaurs from the Triassic period and from the later Jurassic and Cretaceous periods.

    When he started, he assumed that signs of the bends would be rarer in younger fossils, reflecting their gradual evolution of measures to deal with decompression. Instead, he was astonished to discover the opposite. More than 15% of Jurassic and Cretaceous ichthyosaurs had suffered the bends before they died, but not a single Triassic specimen(标本) showed evidence of that sort of injury.

    If ichthyosaurs did evolve an anti-decompression means, they clearly did so quickly—and, most strangely, they lost it afterwards. But that is not what Dr Rothschild thinks happened. He suspects it was evolution in other animals that caused the change.

    Whales that suffer the bends often do so because they have surfaced to escape a predator (捕食动物) such as a large shark. One of the features of Jurassic oceans was an abundance of large sharks and crocodiles, both of which were fond of ichthyosaur lunches. Triassic oceans, by contrast, were mercifully shark- and crocodile-free. In the Triassic, then, ichthyosaurs were top of the food chain. In the Jurassic and Cretaceous, they were prey(猎物) as well as predator—and often had to make a speedy exit as a result.

    Most heroes are not super. They don't appear in comic books, on television, or in movies. They just do what they believe needs to be done to make their world a better place. Bike Batman is one of them.

    Bike Batman is a 30-year-old married engineer who lives in Seattle, Washington. He's a cyclist who also buys and sells bikes as a hobby.

    About three years ago, he was looking for a bike for his wife. He found one on Craigslist, a website where people list things they want to sell. As he often does, he also looked at Bike Index, a popular website that allows users to register their bikes and post reports when they're taken. The bike, which he was considering purchasing, clearly matched one reported stolen on Bike Index. Then he called the person who claimed to be the bike's owner and arranged to meet him-- supposedly to complete the sale. When the two men met, Bike Batman told the thief, "You've got two options. You can wait until a police officer gets here, or you can just get out of here." You can imagine what the thief did.

    After that first success, Bike Batman developed a safer routine. When he sees questionable bike ads on Craigslist, he cross-references the image with bikes reported on Bike Index. Once he has confirmed it with the owner, he arranges a meet-up with the thief and will call the Seattle police department so that officers can participate in the action. In more than half of the 22 cases in which he has got back and returned bikes, the thieves have been arrested. In one case, Bike Batman even helped a family recover a wide range of prized possessions that suspects had stolen during a home burglary.

    His nickname came from a discussion with a police officer who suggested he be called "Robin Hood". Since he wasn't exactly stealing from the rich and giving to the poor, "Batman" seemed a better fit. The idea of a superhero punishing criminals feels pretty silly to him, but the main reason he continues his work is to keep up Seattle's reputation as a friendly city.

If you walk slowly through downtown Helsinki(赫尔辛基) during the day,taking in the splendid 19th century buildings,white boats and noise of passing trams(有轨电车),you will start to understand why it is called a city of two colours:white and blue.

The sea is always present in Helsinki.When you take a walk over the great open space of the central square,you will hear seabirds screaming.When you take the tram,suddenly and unexpectedly,you are faced with a calm,shining blue sea.You may notice that people in Helsinki do not rush about as in other cities.Instead,walk along the roads,politely letting other people by.

A usual way to see Helsinki for the first time is to start out by the boats.You will walk by the elderly women selling fish and vegetables in the market square and find yourself in front of a beautiful park.You may enjoy a pleasant walk in the park for a few hours and then take the tram.Trams are the perfect way to get around in Helsinki.Watching the old houses,parks,theatres,churches,shops,restaurants and people in the streets,you may have a slightly sad film feeling to it.

The pale summer nights are another wonder in the city.Following waterfront(滨水区) of the city after sunset,you couldn't help stopping and listening to the sweet silence,interrupted only by the screaming seabirds and leaving fishing boats.

However,in some way,Helsinki is also the most modern city in northern Europe.You will surely want to visit the white Glass Palace,the art museum,all those extremely popular cafes and design stores.