Bicycle Safety

    Operation Always ride your bike in a safe, controlled manner on campus(校园). Obey rules and regulations. Watch out for walkers and other bicyclists, and always use your lights in dark conditions.

Theft Prevention Always securely lock your bicycle to a bicycle rack—even if you are only away for a minute. Register your bike with the University Department of Public Safety. It's fast, easy, and free. Registration permanently records your serial number, which is useful in the possible recovery of the bike stolen.

Equipment

    Brakes  Make sure that they are in good working order and adjusted properly.

    Helmet  A necessity, make sure your helmet meets current safety standards and fit properly.

Lights Always have a front headlight—visible at least 500 feet in front of the bike. A taillight is a good idea.

Rules of the Road

    Riding on Campus  As a bicycle rider, you have a responsibility to ride only on streets and posted bicycle paths. Riding on sidewalks or other walkways can lead to a fine. The speed limit for bicycles on campus is 15mph, unless otherwise posted. Always give the right of ways to walkers. If you are involved in an accident, you are required to offer appropriate aid, call the Department of Public Safety and remain at the scene until the officer lets you go.

    Bicycle Parking  Only park in areas reserved for bikes. Trees, handrails, hallways, and sign posts are not for bicycle parking, and parking in such posts can result in a fine.

If Things Go Wrong

    If you break the rules, you will be fined. Besides violating rules while riding bicycles on campus, you could be fined for:

No bicycle registration—————————————————$25

Bicycle parking banned————————————————--$30

Blocking path with bicycle ———————————————$40

Violation of bicycle equipment requirement ————————-$35

    English is full of colorful phrases to describe shyness. Someone shy might be called shrinking violet or a wallflower, while for especially nervous types we have the curious expression: they wouldn't say boo to a goose.

    None of these are traditionally seen as positive descriptions, even if you like geese. In a culture of go-getting, high achievers, shy people don't come first. Or that's what the self-help industry would have you believe. Bookshops are filled with vital tomes(巨著) that promise to help beat social fears and find success in life, love and business. That is why one book, Shrinking Violets: A Field Guide to Shyness, bucks the trend. It became a sudden success across English-language media recently for its new take-on shyness.

    Author Joe Moran says that despite struggling with shyness and longing for loneliness all his life, being shy can also be "a gift". Freed from the constant urge to participate and compete in social situations, people are liberated to look at the world in new ways, and gain fresh insights.

    Indeed, many of the world's great thinkers and artists are introverts(内向的人). Scientists Charles Darwin and Albert Einstein preferred their own company; actress Keira Knightley often finds herself tongue-tied at parties; and Harry Potter author JK Rowling claims she used to be too nervous to even borrow a pen.

    Moran told BBC Future: "I think shyness probably does turn you into an amateur anthropologist(人类学家), really-you are more likely to be an observer."

    So, while extroverts make all the noise, they don't necessarily have the best ideas.

    If you're shy, you've probably known this for a long time. You just don't shout about it.

    The yearly Academy Awards ceremony was once a private affair. Now, because of television, it is very much a public affair. Hundreds of people gather in Hoolywood to see the Oscars presented to outstanding actors, and others involved（参与） in the motion picture industry. Millions more watch on the television.

    It all began on May 16, 1929, when 270 men and women sat down to dinner at the Hollywood Roosevelt Hotel. There was no secret about the winners. The names of the winners had been known for months. Janet Gaynor, for example had won as Best Actress. Douglas Fairbanks presented her with the famous gold statue（塑像）. The little statue was not then called Oscar. Like a new actor, Oscar was unknown. About six years later, it somehow got that renowned name. A number of explanations have been offered for its origin(由来), but nobody knows the true story for certain.

    Nowadays the result of the Oscar voting are kept secret. Only two people know the winners before the names are announced at the ceremony. The counting of votes is not done by one group of people but by different groups. Nobody except two members of an accounting company sees the final results.

    The information is not kept in open files. Winners' names are placed in closed envelopes. The accountants each carry a complete set of envelopes to the ceremony. One set is simply a spare to be used in case something happens to the other one.

    Your DNS cache (域名存储器) stores the locations (IP addresses) of web servers that contain web pages which you have recently viewed. If the location of the web server changes before the entry in your DNS cache updates, you can no longer access the site.

    If you encounter a large number of HTML 404 error codes, you may need to clear your DNS cache. After you clear your DNS cache, your computer will query(询问) nameservers (域名服务器) for the new DNS information. The following methods allow you to remove old and inaccurate DNSinformation that may result in 404 errors.

    Windows 7

    To clear your DNS cache if you use Windows 7, perform the following steps:

    Click Start.

    Enter cmd in the Start menu search text box.

    Right-click Command Prompt and select Run as Administrator.

    Run the following command:

    Ipconfig/flushdns

    If the command succeeds, the system returns the following message: Windows IP configuration successfully flushed the DNS Resolver Cache.

    Windows® 8

    To clear your DNS cache if you use Windows 8, perform the following steps:

    On your keyboard press Win+X to open the WinX Menu.

    Right-click Command Prompt and select Run as Administrator.

    Run the following command:

    Ipconfig/flushdns

    If the command succeeds, the system returns the following message: Windows IP configuration successfully flushed the DNS Resolver Cache.

    Windows XP, 2000, or Vista®

    To clear your DNS cache if you use Windows XP, 2000, or Vista®, perform the following steps:

    Click Start.

    On the Start menu, click Run.

    If you do not see the Run command in Vista, enter run in the Search bar.

    Run the following command: ipconfig/flushdns

    If the command succeeds, the system returns the following message: Successfully flushed the DNS Resolver Cache.

    MacOS® 10.10.4 and above

    To clear your DNS cache if you use MacOS X version 10.10.4 or above, perform the following steps:

    Click Applications.

    Click Utilities.

    Click Terminal.

    Run the following command:

    sudo killall-HUP mDNSResponde

    If the command succeeds, the system does not return any output(输出信息).

Warning:

    To run this command, you must know the computer's administrator account password.

    What is the single most effective way to reduce greenhouse-gas emissions? Go vegetarian (素食)？ Replant the Amazon? Cycle to work? None of the above. The answer is: make air-conditioners better. On one calculation, replacing refrigerants (制冷剂) damaging the atmosphere would reduce total greenhouse gases equaling 90bn tonnes of CO₂ by 2050. Making the units more energy-efficient could double that. By contrast, if half the world's population gave up meat, it would save 66bn tonnes. Replanting two-thirds of tropical forests would save 61 bn tonnes. A one-third increase in global bicycle journeys, just 2.3bn tonnes.

    Air-conditioning is one of the world's great overlooked industries. Automobiles and air-conditioners were invented at roughly the same time, and both have had a huge impact on where people live and Work. Unlike cars, though， air-conditioners have drawn little criticism for their social impact, emissions or energy efficiency. Most hot countries do not have rules to govern their energy use. There is not even a common English word for “coolth” (the opposite of warmth).

    Yet air-conditioning has done more than most things to benefit humankind. Lee Kuan Yew, the first prime minister of Singapore, called it “perhaps one of the signal inventions of history”. It has transformed productivity in the tropics(热带地区)and helped turn southern China into the workshop of the World. In Europe, its spread has pushed down heat-related deaths to 10% since 2003, Men 70,000 people than usual, most of them elderly, died in a heatwave. For children, air-conditioned classrooms are associated with better grades at school.

    Environmentalists who call air-conditioning “a luxury we cannot afford” have half a point, however. In the next ten years, as many air-conditioners will be installed(安装)around the world as were put in between 1902(invention time)and 2005.Unless energy can be produced without carbon emissions, these extra machines will warm the world. At the moment, therefore, air-conditioners create a vicious cycle. The more the Earth warms, the more people need them. But the more there are, the warmer the world will be.

    Cutting the impact of cooling requires three things. First, air-conditioners must become much more efficient. The most energy-efficient models on the market today consume only about one-third as much electricity as average ones, Minimum energy-performance standards need to be raised raised, orintroduced in countries that lack them altogether, to push the average unit's performance closer to the standard of the best.

    Next, manufacturers should stop using damaging refrigerants. One type called hydrofluoro-carbons, is over 1,000 times worse than carbon dioxide when it comes to trapping heat in the atmosphere. An international agreement to knock out these pollutants will come into force in 2019.

    Last, more could be done to design offices, malls and even cities so they do not need as many air-conditioners in the first place. More buildings should be built with overhanging roofs or balconies for shade, or with natural ventilation (自然通风).Simply painting roofs white can help keep temperatures down. Providing indoor air-conditioned comfort need not come at the expense of an overheating world.

    For many families, a night at the ballpark is a treat. But it can be a terrible experience for those with autistic(自闭症的)children, who are sensitive to light and noise and usually become upset and scared.

    For these families, fear of how their child will react to new situations­and how others will react to them-keeps them from gaining everyday experiences others get to have.

    Dr. Wendy Ross was heartbroken to see that. The pediatrician(儿科医生)in Philadelphia also knew that separation from the community didn't serve her patients well in the long run.

    "If kids are not in the community, building their skills from very young ages, then there's no reason to expect them to be independent one day," Ross said. "It's a social disability. It needs to be addressed in a social setting."

    So in 2007, Ross set out to do just that. Today, her nonprofit, Autism Inclusion Resources, helps families affected by autism deal with challenging social situations, such as sporting events, airport travel and museum visits.

    Many Major League Baseball teams hold annual 44autism awareness nights", when they take temporary measures such as lowering the volume (音量)on the public address system. But Ross wanted to do more. "You can't turn down the volume of the world," Ross said. "It's nice to do it for one night, but our goal is for families to be able to go to a game on any night."

    To that end, Ross partnered with the Philadelphia Phillies to develop a creative program.

    She armed all the Phillies players and game-day staff with knowledge about autism and how to interact with individuals who have the disorder. Each family is also provided a clinician at the game who gives additional support if problems arise. She also helps prepare the families for the event.

    Ross has also found her airport travel program to be successful for families. Using the same principles, she trains airline and security staff at major airports and then guides families through the travel experience, including checking in, going through security and boarding a plane.

    Ross hopes that the tools she gives families can help them explore other settings on their own. "We really see it as a stepping stone to a brighter future," she said.