No one is sure how the ancient Egyptians built the pyramids near Cairo. But a new study suggests they used a little rock‘n'roll. Long-ago builders could have attached wooden pole s to the stones and rolled then across the sand, the scientists say.

     “Technically, I think what they're proposing is possible,” physicist Daniel Bonn said.

    People have long puzzled over how the Egyptians moved such huge rocks. And there's no obvious answer. On average, each of the two million big stones weighed about as much as a large pickup truck. The Egyptians somehow moved the stone blocks to the pyramid site from about one kilometer away.

    The most popular view is that Egyptian workers slid the blocks along smooth paths. Many scientists suspect workers first would have put the blocks on sleds(滑板). Then they would have dragged them along paths. To make the work easier, workers may have lubricated the paths either with wet clay or with the fat from cattle. Bonn has now tested this idea by building small sleds and dragging heavy objects over sand.

    Evidence from the sand supports this idea. Researchers found small amounts of fat, as well as a large amount of stone and the remains of paths.

    However, physicist Joseph West thinks there might have been a simpler way , who led the new study . West said , “I was inspired while watching a television program showing how sleds might have helped with pyramid construction . I thought , ‘Why don't they just try rolling the things?'“A square could be turned into a rough sort of wheel by attaching wooden poles to its sides , he realized . That , he notes , should make a block of stone” a lot easier to roll than a square”.

    So he tried it.

    He and his students tied some poles to each of four sides of a 30-kilogram stone block. That action turned the block into somewhat a wheel. Then they placed the block on the ground.

    They wrapped one end of a rope around the block and pulled. The researchers found they could easily roll the block along different kinds of paths. They calculated that rolling the block required about as much force as moving it along a slippery(滑的)path.

    West hasn't tested his idea on larger blocks, but he thinks rolling has clear advantages over sliding. At least, workers wouldn't have needed to carry cattle fat or water to smooth the paths.

    Like all big cities, Paris has a traffic problem: lots of cars, lots of traffic jams (阻塞) and lots of pollution from exhaust fumes (废气). So the city began a scheme (计划) to improve the situation.

    Under the Velib scheme ('Velib' comes from vélo liberté, or 'bicycle freedom') people can take a bicycle, use it for as long as they want, and then leave it at the same or another bicycle station. The first half-hour on the bike is free, but if you don't return it after 30 minutes, you have to pay. But it's only €1 a day or €29 a year! The bicycles are heavy (25 kg), and they are all grey and have baskets. There are about 20,000 of them in the city, and around 1,450 bicycle stations. So there are a lot more Velib stations than the 298 subway stations!

    Paris is not the first city to have a scheme like this. But not everybody thinks it's a great idea. One Parisian said, 'These bicycles are only for short journeys. If people want to travel across the city, they won't use a bicycle—they'll still use their cars.'

    A city spokesman said, "The bicycle scheme won't solve all our traffic problems, of course. But it might help reduce air pollution. Traffic, together with factory fumes, is a big problem. There aren't any simple answers to traffic problems and pollution in cities. But unless we do something now, there will be more traffic jams and temperatures will continue to rise, so the problems in our environment will get worse. The bikes might help people to lead a healthier life, too."

    On a freezing cold day, a couple had to move into a small apartment because of their failure in business. The husband worked day and night to support the family but gave no care of his wife. So she thought, "He doesn't love me any more. He just cares about his business ... not me"．

    One day, she was about to take a shower when he stopped her at the door, "Let me take it first, okay?" "Why not me first?" she asked. "I am tired, honey, you take it later, okay?" She was entirely unhappy.

    One day, she found nothing to do and turned on his computer. A few words came into her sight. Reading them, she burst into tears. It was his diary：

    Today, I was quite sad. She asked me why I was always taking the shower first, and I said to her, "I was exhausted." She was unhappy. In her mind, I treated her not as well as usual, but what could I do? I was not as rich as before! We moved to the small apartment, and there was only one shower in the bathroom. It was so cold to take a shower in such a cold winter. But I found that if one person took the shower first, the room could get a little warmer. So every day I rushed to the bathroom first. I was thinking that, when she took the shower, the room would get warmer, even if it was only 1℃.

    Now I cannot give her a comfortable life, take her to good restaurants, or buy expensive dresses for her, but at least, I can give her 1℃ love.

    As a senior high school student, my future is always on my mind. To be exact, thoughts of the future have kept me up countless nights and made me worry enough to do poorly on more than one test. Because of this, words of wisdom are a source of comfort. Steve Jobs gave a speech to Stanford's graduating class in 2005 and his words resound repeatedly in my mind whenever I think about my future.

    It wasn't always like that, though. It started when I became a junior, when college came into view. It's the first big step to making your life your own. So when Jobs discussed his life as a student, some fears were eased. He, too, felt the need to attend college to make something of himself. He faced what many are extremely afraid of: uncertainty. His lack of understanding caused him to stop attending college and focus on what he felt was important. His story had a happy ending, of course, since he certainly turned out well.

    This doesn't mean that students shouldn't attend college, but rather that they shouldn't worry so much. You'll get where you need to go, even if your path is a bit more winding(蜿蜒的)than you'd like.

    Jobs talked about the hardships in his work. His love of his work helped him carry on and he got where he was meant to be, which restates the point: don't panic.

    One particular part of his speech stayed with me. Steve Jobs quoted(引用)the saying "Stay hungry, stay foolish" and it has become my motto. Staying foolish is realizing that you are still a fool, no matter how much you've learned or experienced. There is always more to explore. Staying hungry is wanting to find those things about which you are still uneducated.

    Steve Jobs's level of success is attainable, and I aim to prove that. With the will power to go into the world living every day like it's my last and allowing the future to take care of itself, I will do great things. In the last moments of my life, I'll be proud of what I have done and hope to have all the wisdom a person could wish for.

The Palace Museum's clock collection, more than 1,500 in number, is arguably one of the most breathtaking clock preservations worldwide. {#blank#}1{#/blank#} (make) between the 18th century and the 20th century, some were crafted in Britain, France and Switzerland, some were from the Clock Worship of the Qing Palace, the others were {#blank#}2{#/blank#} mixture of both the East and the West.

The {#blank#}3{#/blank#} (major) of British clocks feature bronze cases inlaid with splendidly colorful jewels. They are diverse {#blank#}4{#/blank#} form, recreating all kinds of architecture and natural sights, and often include automatic {#blank#}5{#/blank#} (decorate) such as fountains, moving figures, boats and birds. These clocks represent the highest level of craftsmanship in Britain.

Most of the French clocks here are the products of the early 20th century. Whether in terms of theme {#blank#}6{#/blank#} decorative style, the French clocks in the collection have a style of {#blank#}7{#/blank#} (they) own, and deserve their place in history.

The Swiss timepieces {#blank#}8{#/blank#} (most) comprise small, unconventionally shaped desk clocks and delicate pocket watches. They were specially made {#blank#}9{#/blank#} (suit) the tastes of Chinese customers.

Clocks may turn back in time, but humans may never dream of doing so. Today, the Palace Museum {#blank#}10{#/blank#} (aim) to carry on this touching tale of "time" as guardians of this traditional craftsmanship.

Ammaar Reshi, 28, has been fascinated by technology since he was a child. One day, when he was experimenting with an AI-powered chatbot, he began to consider how artificial intelligence could be used to create a basic children's book to give to his friends. Without ever picking up a pen and paper, he created a 12-page picture book. 

Just 72 hours later, Reshi self-published his book on Amazon's digital bookstore. The next day he got the paperback（平装书）, which was made available for free through another Amazon service called KPD. 

Reshi said he paid nothing to have the book created and published, although he has already paid for a $30-per-month Midway subscription. Impressed by the speed and results of his project, Reshi shared the experience in a Twitter thread that attracted more than 2,000 comments and 5,800 retweets（转发）. 

Reshi stated that he received great feedback（反馈）from users, who lauded his creative work at first. But the next day, the replies were negative. "There was this incredibly passionate reaction," Reshi said. "At 4 am, I was woken up by my phone ex ploding every two minutes with a new tweet saying things like ‘We hate you'. "

Reshi was taken aback by the outpouring of emotion in response to what was supposed to be a present for some friends' children. He didn't realize he had landed in the heart of a much broader argument. 

Some artists have expressed concern that AI art generators are stealing their work in response to Reshi's book. And some artists claim that their work has been used without their permission to train Al picture generators. 

"I wouldn't even call myself an author," Reshi said. "The AI is essentially the ghostwriter（代笔者）, and the other AI is the illustrator. " But he thought the process was creative.