During my free time one day, I wandered down a lonely path into the woods and sat against a tree. Then I saw one of the camp counselors approaching me. "Oh great," I thought, since counselors were always trying to cheer you up or make you laugh.

    "Hey," he said, "mind if I have a seat?" I shrugged(耸肩). I wasn't going to encourage him, but I couldn't exactly stop him, either. He sat down alongside me and extended a hand. "I'm Gary," he said, "and you're Erica, right?" I nodded. "You don't exactly look like you're having a good time," he began.

    I crossed my arms and gritted my teeth. "Look," I said, "I didn't want to come to camp, I don't like it, I'm not having fun, and it basically stinks." I glared at Gary.

    "So there's nothing here at all for you, huh?" he asked.

    "Nothing," I answered.

    "Let me show you something," said Gary. He got up, and I followed him along the path until I heard a sound like a roaring freight train.

    "What's that?" I asked.

    "Wait and see," he replied, with a small smile.

    When we rounded the corner, I couldn't believe what I saw. There was the biggest waterfall I could ever imagine, right in front of me. "Cool!" I said, and I could feel my eyes getting bigger and a smile tugging at my mouth.

    "Still think there's nothing here for you?" asked Gary. "Because there's a whole lot more of this kind of 'nothing' around here." I had to admit, the waterfall was impressive.

    "Look," said Gary, "camp is what you make it. You can be sullen(阴郁的) and closed-minded and have a rotten four weeks, or you can take a look around you and see some of the incredible sights and appreciate the opportunity. It would be useless for me to try to make you have fun. You can only do that for yourself. But if you loosen up a little, you might actually have a good time." With that, he turned and walked away, leaving me on the path.

    That night, by the campfire, I found myself singing along with everyone else. By the time the four weeks were up, I didn't want to leave. I'd seen some amazing things and made some great friends.

    Beauty is where you find it. Life is what you make it. I think it's going to be a good year this year. I mean, I'm going to work to make it one. Maybe if I'm lucky, I'll get to go back to camp next year!

    We once had a poster competition in our fifth grade art class.

    “You could win prizes,'' our teacher told us as she wrote the poster information on the blackboard. She passed out sheets of construction paper while continuing, “The first prize is ten dollars. You just have to make sure that the words on the blackboard appear somewhere on your poster.”

    We studied the board critically. Some of us looked with one eye and held up certain colors against the blackboard, rocking the sheets to the right or left while we conjured up our designs. Others twisted their hair around their fingers or chewed their erasers while deep in thought. We had plans for that ten-dollar grand prize, each and every one of us. I'm going to spend mine on candies, one hopeful would announce, while another practiced looking serious, wise and rich.

    Everyone in the class made a poster. Some of us used parts of those fancy paper napkins, while others used nothing but colored construction paper. Some of us used big designs, and some of us preferred to gather our art tidily down in one corner of our poster and let the space draw the viewer's attention to it. Some of us would wander past the good students' desks and then return to our own projects with a growing sense of hopelessness. It was yet another grown-up trick of the sort they seemed especially fond of, making all of us believe we had a fair chance, and then always — always — rewarding the same old winners.

    I believe I drew a sailboat, but I can't say that with any certainty. I made it. I admired it. I determined it to be the very best of all of the posters I had seen, and then I turned it in.

    Minutes passed.

    No one came along to give me the grand prize, and then someone distracted me, and I probably never would have thought about that poster again.

    I was still sitting at my desk, thinking, What poster? when the teacher gave me an envelope with a ten-dollar bill in it and everyone in the class applauded for me.

    Oh, the places you'll go!

    When it comes to habitat, human beings are creatures of habit. It has been known for a long time that, whether his habitat is a village, a city or, for real globe-trotters (周游世界者), the planet itself, an individual person generally visits the same places regularly. The details, though, have been surprisingly obscure. Now, thanks to an analysis of data collected from 40,000 smartphone users around the world, a new property of humanity's locomotive (移动的) habits has been revealed.

    It turns out that someone's "location capacity", the number of places which he or she visits regularly, remains constant over periods of months and years. What constitutes a "place" depends on what distance between two places makes them separate. But analyzing movement patterns helps illuminate the distinction and the researchers found that the average location capacity was 25. If a new location does make its way into the set of places an individual tends to visit, an old one drops out in response. People do not, in other words, gather places like collector cards. Rather, they cycle through them. Their geographical behavior is limited and predictable, not fancy-free.

    The study demonstrating this, just published in Nature Human Behavior, does not offer any explanation for the limited location capacity it measures. But a statistical analysis carried out by the authors shows that it cannot be explained solely by constraints on time. Some other factor is at work. One of the researchers draws an analogy. He suggests that people's cognitive capacity limits the number of places they can visit routinely, just as it limits the number of other people an individual can routinely socialize with. That socialization figure, about 150 for most people, is known as the Dunbar number, after its discoverer, Robin Dunbar.

    Lehmann says his group is now in search of similar data from other primates (灵长目动物), in an attempt to work out where human patterns of mobility have their roots. For those, though, they will have to rely on old-fashioned methods of zoological observation unless they can work out a way to get chimpanzees to carry smartphones.

    Even by the standards of poor countries, India is alarmingly — and unnecessarily — dirty. It needs to clean up. Most time of year, its capital, Delhi，smells as if something is burning. That is because of many things: the carcinogenic diesel（柴油）that supplies three quarters of the city's motor fuel, the dirty coal that supplies most of its power, the rice stalks that nearby farmers want to clear after the harvest and so on. All these make Delhi's air the most poisonous of any big city.

    This does not just make life unpleasant for a lot of Indians. It kills them. Recent estimates put the annual death toll from breathing PM 2.5 alone at 1.2—2.2 million a year. The lifespan of Delhi residents is shortened by more than ten years, says the University of Chicago-Consumption of dirty water directly causes 200,000 deaths a year, a government think-tank estimates, without measuring its contribution to slower killers such as kidney disease. Some 600 million Indians, nearly half the country, live in areas where clean water is in short supply. As pollutants taint groundwater, and global warming makes the vital monsoon（季风）rains more abnormal, the country is poisoning its own future.

    Indian pollution is a danger to the rest of the world, too. Widespread dumping of antibiotics（抗生素）in rivers has made the country a hotspot for anti-microbial（抗微生物）resistance. Emissions of carbon dioxide, the most common greenhouse gas, grew by 6% a year between 2000 and 2016, compared with 1.3% a year for the world as a whole.

    In the past India has explained its failure to clean up its act by pleading poverty, noting that richer countries were once just as dirty and that its output of waste per person still lags far behind theirs. But India is notably grubby（肮脏的）not just in absolute terms, but also relative to its level of development And it is becoming grubbier.

    It is true that some ways of cutting pollution are expensive. But there are also cheap solutions，such as undoing mistakes that Indian bureaucrats（官僚）have themselves made. By funding rice farmers, for instance, the government has in effect cheered on the overusing of groundwater and the burning of stalks. Rules that encourage the use of coal have not made India more self-reliant, as intended, but instead have led to big imports of foreign coal while blackening India's skies. Much cleaner gas-fired power plants, meanwhile, sit idle.

    Reliant on big business for funding and on the poor for votes, politicians have long ignored middle-class complaints about pollution, failing to give officials the backing to enforce rules. That is a pity, because when India does apply itself to ambitious goals, it often achieves them

    Next year it will send its second rocket to the Moon.

    Narendra Modi, the prime minister, promised with admirable frankness when he took over to rid the country of open defecation（缺陷）. Four and a half years and some $9 billion later, his Clean India campaign claims to have sponsored the building of an astonishing 90 million toilets. This is impressive, but India is still not clean. Its skies, its streets, its rivers and coasts will remain dangerously dirty until they receive similar attention.

    We work with Cambridge County Council's Participation Team to create opportunities for young people to visit the University and learn more about it. The following events are scheduled for the 2019/2020 academic year.

    Superstar workshops

    12 engaging workshops are planned for young people aged 7 to 11. These half-day visits will be held throughout the year, at times when young people are not at school. If participants complete 8 of the 12 workshops, they will be awarded the nationally recognized Superstar Crest Award.

Please note, workshops will only run if we have a sufficient number of attendees (usually around 3+ participants).

    Explore University Days

    Explore University Days are for young people aged 12-15. Participants visit the University for two days and engage with a range of university-related workshops, and other fun activities.

Previous participants have engaged with the following:

    Visited the Sports Centre

    Took part in a Neuroscience workshop

    Enjoyed a two-course meal at a University College

    Dates will be confirmed in early December 2019, and a schedule for event will follow in the New Year.

    Events for post-16 students

    If you are studying for your post-16 qualifications and are considering applying for Cambridge or would like to find out more about a specific subject, the following events might be for you:

    University and College Open Days

    Subject Master classes

    Cambridge Science Festival

    Three important changes that will affect people's everyday life in the future.

    The cashless society

    Cash and bank notes will disappear almost completely. They will be replaced by smart cards with microchip (微芯片) "loaded" with some money. When we pay for goods, we will put our smart cards into a payment terminal (终端) and money will be transferred (转) from our cards to the retailer's (零售商的) card. When all the money is used up, we will be able to "reload" it by inserting it into a telephone, dialing our bank account and putting money to the card from the account. If we want to transfer money from our cards to a bank account, we will use the same method. Smart cards will be able to hold several different currencies at the same time. So if we go abroad, we will be able to use our smart cards in the same way.

    Interactive telephones

    Human telephones will be replaced by talking computers. These computers will recognize speech, ask us what information we need, find the information and change it to speech. If we want to book a flight or pay a bill by phone, we will ask a talking computer to do it. Of course, this won't happen until all the technology is in place, but when it is we will soon get used to using computers in this way.

    ________________

    Traffic congestion (拥挤) in cities will be reduced because drivers will use electronic maps to find the quickest way to their destinations and avoid traffic jams. Because people have to pay to drive in cities, they will stop using their cars and use public transport instead. Speed control systems will be built into cars. These systems will control the speed of the car according to the traffic and weather conditions and prevent accidents.