When I was in my third year at university, my roommates were American footballers, so I decided to join them. I remember seeing them in front of me wearing pads (防护垫), and thinking they were going to kill me. I got tackled (阻截) so hard that I was frightened. But then I realized it was just physical contact. I've been addicted since.

The fundamental aim of the game is to score by running with the ball into, or receiving the ball inside the opposition's end zone. Every player on the field has a set responsibility. I'm a running back. My job is using my speed, strength and skill to carry the ball and keep running until either I score or I get put down. And it does hurt.

I've broken two fingers and hurt my shoulder, but the worst was when I trapped the ligaments (韧带) in the back of my leg. I had to take a year out. But none of that put me off- all I could think was how I was going to come back stronger. Besides training with the team, I now have my gym routine to get fitter, faster and stronger.

Although people think American football is aggressive, there's much more to it. Every team has its own playbook, outlining everyone's role in different scenes. My playbook was 73 pages long. Words can't describe how it feels when it all comes together on the field.

American football has changed my life for the better. I've learned time management, how to take responsibility for my action, and how much I treasure being part of a team. Within the four lines of the field, it is physical. Emotions run high. If you're on the opposing team, you are my enemy. But once the game is done, we're like a big family.

    I went through a training program and became a literacy volunteer(扫盲志愿者)last summer. The training I received, though excellent, did not tell me how it was to work with a real student. When I began to discover what other people's lives were like because they could not read, I realized the true importance of reading.

    My first student Marie was a 44-year-old single mother of three. In the first lesson, I found out she walked two miles to the nearest supermarket twice a week because she didn't know which bus to take. When I told her I would get her a bus schedule, she told me it would not help because she could not read it. She said she also had difficulty once she got to the supermarket because she couldn't always remember what she needed. Since she did not know words, she could not write out a shopping list. Also, she could only recognize items by sight, so if the product had a different label(标识), she would not recognize it as the product she wanted.

    As we worked together, learning how to read built Marie's self-confidence, which encouraged her to continue her studies. She began to make rapid progress and was even able to take the bus to the supermarket. After this successful trip, she reported how self-confident she felt. At the end of the program, she began helping her youngest son, Tony, a shy first grader, with his reading. As she described this experience, I was proud of myself as well. I found that helping Marie to build herself-confidence was more rewarding than anything I had ever done before.

    As a literacy volunteer, I learned a great deal about teaching and helping others. In fact, I may have learned more from the experience than Marie did.

    The UNESCO has recognized the Chinese art of paper cutting on its Intangible Cultural Heritage List. But paper cutting is at the risk of disappearing.

    Voyo Woo, a Chinese immigrant, who loves paper cutting, worked hard to celebrate the ancient art form. With a keen interest in paper cutting, Ms Woo held a paper cutting exhibition at a shopping center near Washington. "I really love it. I get so much fun by doing it. So I'm just kind of hoping that more people will learn about this art which is about to disappear. I think it's time to take action. So I held it."

    Voyo Woo began to study paper cutting when she was a 14-year-old girl in southeastern China. Voyo Woo's teacher gave her extra training after class because Voyo Woo discovered a special love for it. Later, her beautiful paper cuttings won second prize in a national painting competition. "Paper is the easiest material that you can find. You can just turn it into beautiful art. I think it is like magic to me."

    Ms Woo came to the US after she finished college in 2008. She has been invited to show the art at a wide collection of events. She also has shown her skill and works at famous museums like the Smithsonian Institution's Freer and Sackler art galleries in Washington.

    "I saw so many people coming to me and asking me. They were amazed. I think it's important to introduce the art form to American people or anyone who is interested."

    Ms Woo placed examples of her art around her as she displayed paper cutting at the shopping center. Ann Russ, a shopper, was attracted by the nature of the work. She said it put her at ease. "I like to know about Chinese art, specifically because it's almost relaxing to put that much effort into it," Russ said.

    Smart Kids is a collection of one hundred events scheduled in October. This year, it is experimenting with Pay What You Decide (PWYD). That is, you can decide to pay what you want to or can afford, after you have attended an event. You can pre-book events without paying for a ticket in advance. Here are some of the director's picks.

    Walk on the Wild Side

    Not ticketed, Free

Join storyteller Sarah Law to hear science stories about animals. Along the way you'll meet all sorts of beautiful creatures and discover life cycles and food chains. Best suited to children aged 5-9. Children under 8 must be accompanied by an adult.

    Introduction to Waves

    Pre-book, PWYD

    Subjects range from sound waves to gravity waves, and from waves of light to crashing waves on the ocean. Mike Goldsmith explores the fundamental features shared by all waves in the natural world.

Science in the Field

    Not ticketed, Free

This storytelling night features a scientist sharing his favourite memories of gathering first-hand data on various field trips. Come along for inspiring and informative stories straight from the scientist's mouth. Join Mark Samuels to find out more in this fun-filled workshop.

    Festival Dinner

Pre-book, £25 per person

Whether you want to explore more about food, or just fancy a talk over a meal, join us to mark the first science festival in London. Which foods should you eat to trick your brain into thinking that you are full? Find out more from Tom Crawford.

    Philadelphia, Pennsylvania is America's fifth largest city. Once a major American colonial city, it is the home of America's first library, its first hospital, and its first zoo. Now it is also the first US city to be named a World Heritage City. On November 6, 2015, Philadelphia joined more than 260 other cities that have been recognized for their influence on the world. These cities include Paris, France, Florence, Italy, and Cairo, Egypt.

    "Today marks the start of a new and exciting chapter in the history of Philadelphia," remarked Philadelphia Mayor Michael Nutter when the announcement was made. "As a World Heritage City, Philadelphia is being officially recognized on the global stage for its wealth of contributions to the world.

    To be named a World Heritage City, a city must be home to a UNESCO World Heritage site. UNESCO World Heritage sites are selected for their universal value and significance. For Philadelphia, the site is Independence Hall.

    Independence Hall is where two of the most important documents in US history—the Declaration of Independence and the US Constitution—were adopted. The Declaration of Independence, approved on July 4, 1776, united the 13 former British colonies and declared them independent from British rule. The US Constitution, signed in 1787, established the American democratic system of government. A democracy is a system of government in which the people elect their leaders. The Constitution later spelled out the basic freedoms American citizens have.

    Philadelphia Deputy Mayor Alan Greenberger says the city's selection as a World Heritage City also reflects its educational, cultural, and economic achievements. The city is home to dozens of colleges and universities, and many museums, such as the Philadelphia Museum of Art. "Philadelphia has rightfully earned its place as one of the greatest cities in the world." Greenberger says.

    LONDON­Britain prepares for a vote Thursday that will decide whether it leaves the European Union. The debate has centered on immigration and economic security. Both sides have lowered the tone of their arguments after a three­day suspension(暂停) of campaigning that followed the murder of an anti­Brexit lawmaker, an incident that polls(民意调查) suggest has shocked many previously undecided voters who now say they will vote to remain.

    These are uncertain times in a nation whose economy is the second largest in the European Union. The risks are huge. There are warnings that leaving the 28­member group may cause the British pound to lose 15 percent of its value and bring the resignation(辞职) of David Cameron, the country's prime minister; his stay or not depends on whether Britain listens to him and votes to remain.

    For months, the Leave campaign has been hitting the streets. Its arguments are based largely on immigration, and the belief that Britain has handed control of its borders(边界) to a European super state: "The U.K. has lost control over migration. We have to accept anyone into this country if they have an EU passport, no matter if they have a criminal record or not. We are not allowed to say 'no' to people and that is damaging for the security of the U.K., but it is also putting pressure on jobs and opportunities for young people," said Tom Harwood, a Brexit campaigner.

    The murder of Jo Cox, an anti­Brexit, pro­immigrant lawmaker by a far right extremist(极端分子) with a history of mental problems had a serious effect on both campaigns, and on voters.

    Polls since the June 16th murder showed the Leave camp losing ground, but with both sides still very close on a referendum(全民投票) that many believe could change the course of European history.