The Chinese invented paper in 105 A. D. They mixed the bark of a tree and rags (破布) with water, put a screen into the mixture, and lifted out a thin piece of wet paper. They dried the paper in the sun.

    The Chinese kept their secret of how to make paper until a war with Muslims in the ninth century. The art of papermaking soon spread throughout the Muslim world.

    The Mayan Indians in Central America and Pacific Islanders also discovered how to make paper, but their knowledge never spread to the rest of the world.

    For centuries, all paper was made by hand. Rags were the main material. Then a French scientist discovered that people could make paper from wood, too. Finally, in the eighteenth century. a Frenchman invented a machine to make paper from wood.

    When other nine-year-old kids were playing games, she was working at a petrol station. When other teens were studying or going out, she fought to find a place to sleep on the street. But she beat these terrible setbacks（挫折） to win a highly competitive scholarship and gain entry （录入）into Harvard University. And her amazing story has inspired a movie, “Homeless to Harvard: The Liz Murray Story”.

    Liz Murray, a 22-year-old American girl, has been writing a real-life story of willpower and determination. Liz grew up with two drug-addicted parents. There was never enough food or warm clothes in the house. Liz was the only member of the family who had a job. Her mother had AIDS and died when Liz was just l5 years old. The effect of that loss became a turning point in her life. Connecting the environment in which she had grown up with how her mother had died. She decided to do something about it.

    Liz went back to school. She threw herself into her studies, never telling her teachers that she was homeless. At night, she lived on the streets. “What drove me to live on had something to do with understanding, and by understanding that there was a whole other way of being. I had only experienced a small part of the society,” she wrote in her book Breaking Night.

    She admitted that she used envy （妒忌）to drive herself on. She used the benefits that come easily to others, such as a safe living environment, to encourage herself that “next to nothing could hold me down”. She finished high school in just two years and won a full scholarship to study at Harvard University. But Liz decided to leave her top university a couple of months earlier this year in order to take care of her father, who has also developed AIDS. “I love my parents so much. They are drug addicts. But I never forget that they love me all the time. ”

    Liz wants moviegoers（常看电影的人） to come away with the idea that changing your life is “as simple as making a decision”.

    As a capital city full of art and history, London is an important political centre and a huge financial marketplace. Whatever you think about London, visiting as a tourist is very different from living there. Each part of London has its own character. Some parts are richer than others, or more industrial, or have better housing.

    Let's start with the centre, the “Square Mile”. This is the oldest part of London. In the past, it was where all financial business was done. Not many people live here, but 300,000 people work here every day.

    Moving west, we come to the West End. This busy shopping and entertainment district is bursting with things to do. Take a walk down Oxford Street, and you will see big department stores like Selfridges and Harrods. Rents here are very high; a one-bedroom apartment may cost around 1,000 pounds a week. Further away is West London. This area is more residential(住宅的)and very fashionable.

    The East End contains the Port of London, which historically is where many immigrants first arrived. Waves of French, Belgians, Jews, Pakistanis and Bangladeshis have all lived here. This makes the culture of this area very various. London won the bid to hold the Olympics in 2012, so many Londoners hope that housing, education and employment for many people in this area will improve.

    It is difficult to be general about London. The city is made up of a " collection of villages”, each area with its own character and community. Put them all together, and you have London, an international capital.

    When he was 22, Rob Stewart traveled the world for four years. He wanted to call attention to the mistreatment of sharks. His 2007 film, Sharkwater, documents the cruel practice of removing sharks' fins (鳍) for money and leaving the animals to die. In his latest documentary, Revolution, Stewart takes on an even bigger challenge: climate change.

    The Canadian filmmaker says that climate change has harmed people and places everywhere: "It is stronger than any government or organization. If we educate people, they will make better decisions about protecting natural resources. "

    According to a recent report on climate change, "The atmosphere and ocean have warmed, the amounts of snow and ice have reduced, and sea levels have risen." These developments are endangering crops, wildlife, fish, and even people.

    Stewart says that the consequences of climate change will be irreversible unless people take action, especially young people."It's up to kids to be the moral compass (道德指南) of society," he believes, "and say, 'Guys, this is not right.'"

    Many kids took action after seeing Sharkwater. Elementary school students in the Northern Mariana Islands, for example, got their local government to ban the sale of shark fins.

    Felix Finkbeiner, 17, of Germany is also part of the "revolution" to save the planet. In 2007, Felix started a youth group called Plant-for-the-Planet, whose motto is "Stop Talking. Start Planting." The group raises money to plant trees. So far, Plant-for-the-Planet has planted nearly 200 trees around the world. "Future generations are the ones who will be suffering the most from inaction (无作 )," Felix says. His goal is to plant millions of additional trees.

    "When we started four years ago," Felix tells Stewart in Revolution, "we thought we had to save the polar bear. We thought we had to save the environment. But soon after, we found out that it's about our future, that we have to save our own future."

Sea, Sun, Sand and South Africa: Readers' Favorite Beaches

    The Wild Coast five-day hike from Kei Mouth to Coffee Bay in South Africa is surely the best experience for beach lovers.

    Robben Island beaches

    On a visit to the prison museum here, be sure to leave time to explore the island's beaches. Few visitors realize that the island's shores are the natural habitat of sizable penguins: enjoy watching them with far fewer tourists here. Bird life is plentiful and includes oystercatchers, ibis, egrets and cormorants. Sharks and dolphins can often be spotted offshore too.

    Sand, sea and sculpture, Durban

    There's more to Durban's Golden Mile than sunbathing and surfing. Not only is there a gallery of sand sculptures(雕像) and drawings, but Lucas, one of the best local artists, offers lessons. His amazing rhino(犀牛) is the only permanent item in a frequently changing exhibition. Lucas charges a modest R50 (£3) for a fun and surprisingly physical hour of creativity. Or, you could ask him to create a personalized sculpture for a special occasion.

    Paternoster, Western Cape

    Paternoster is a small beach community about 150 km north of Cape Town. The town has a number of rentals(租赁), all the Cape Dutch architecture you could want for a weekend away and some great food. Long walks on the beach, eating and drinking and watching the fishing boats make for a peaceful break. And, unlike in Cape Town, you can dip your toes in the sea without your legs freezing solid.

    Google's new camera, called Clips, is a small, smart device. It comes with a case that has a clip (夹子), but it's not designed to be worn on your clothing. Most interestingly, it uses artificial intelligence to take photography out of your hands so it can capture moments on its own.

    This roughly 2-inch by 2-inch camera, with a three-hour battery life and Gorilla Glass for toughness, is intended for candid moments, like when a child does something cute that may happen too quickly for you to pull out your smartphone.

    Onboard the Clips device, it uses machine learning algorithms (计算程序) to help capture scenes. Those algorithms include face recognition. "Once it learns that there's a face you see frequently, it'll try to get nice photos of those faces," said Juston Payne, the device's product manager. And they also want it to recognize facial expressions, which involved "training it to know what happiness looks like". The Google team also trained it to recognize what not to shoot—like when a child's hand is over the lens, or if it is tossed in a dark purse.

    The only way to see the images is by connecting the camera with your phone, as it has no screen for viewing or editing.

    Were people concerned it could seem strange? Yes, Payne admitted. But they said they addressed that by making it obvious what it is. A green light on the front signals that it is on. Besides, unlike a camera meant to monitor your home, it is not connected to the Internet.

    "This product is only possible because of the way that silicon has advanced" Payne said, noting that it was only in the past year or so that they could squeeze the technology down into a device this size. Going forward, we're likely to get more assistance from the artificial intelligence packed into our apps and gadgets.