From the modern London Eye to the historic Tower of London, below are London's most visited tourist attractions. Many of London's top attractions are free, making them affordable places to learn about some culture. Whether you prefer history or modern art, you'll find it at one of these must-visit spots.

British Museum

    The world-famous British Museum exhibits the works of man from prehistoric to modern times, from around the world. The most interesting and exciting parts include the Rosetta stone, the Parthenon sculptures and the mummies in the Ancient Egypt collection. Some exhibitions require tickets.

National Gallery

    The greatest and most beautiful building of Trafalgar Square, London's National Gallery is a vast space filled with Western European paintings from the 13th to the 19th centuries. In this impressive art gallery you can find works by masters such as Van Gogh, da Vinci, Botticelli, Constable, Renoir, Titian and Stubbs. Some exhibitions require tickets.

Tate Modern

    Sitting on the banks of the Thames is the Tate Modern, Britain's national museum of modern and contemporary art. Its unique shape is due to it being a power station before. The gallery's restaurants offer wonderful views across the city. Some exhibitions require tickets.

Coca-Cola London Eye

    The Coca-Cola London Eye is a major feature of London's skyline. It has some of London's best views from its 32 capsules, each weighing 10 tonnes and holding up to 25 people. Climb aboard for a breathtaking experience, with an unforgettable view of more than 55 of London's most famous landmarks -- all in just 30 minutes!

Madame Tussauds

    At Madame Tussauds, you'll come face-to-face with some of the world's most famous faces. From Shakespeare to Lady Gaga you'll meet influential figures from show business, sport, politics and even royalty. Strike a pose with Usain Bolt, get close to One Direction or receive a once-in-a-lifetime audience with Her Majesty the Queen.

    Both are so much related to each other. And both are so dissimilar! What are the differences between friendship and love? Is platonic (理想的) friendship possible between persons of opposite sex? Let us try and understand.

    What is friendship? Why do we call a person our friend? When do we call someone a very good friend? If we care for a person, if we are always ready to help that person and if we share most of our thoughts with a person, they are our good friends. We can always count upon our good friends in an emergency. We are always sure that our friend will understand why we acted in a certain way. We need not explain anything to our very good friends. The friendship is so deep and the relationship is so close.

    What about love? In a relationship of deep love, all the sharing that we discussed above are taken for granted. But love transcends (胜过) all this. During love, we are attached with a particular person, while in friendship, one may have many friends. A loving relationship makes one so much attached to the other, that one gets pained if his/her beloved is hurt! Love also involves a physical element. Friendship does not have that. This is a vital difference. Nature gives us love but does not give us friendship.

    Your heart beats will never increase in expectation of meeting your friend. You will not lie awake at night thinking about your friend. You will not feel totally lost, if you don't meet your friend for a few days. You will not have dreams in your eyes thinking about your friend. But in love, you will do all this and much more. Indeed, there is no comparison between love and friendship.

    A man came home from work late, tired, to find his 5-year-old son waiting for him at the door.

    “Daddy, how much money do you make each hour?”

    “If you must know, I make ＄20 each hour.”

    “Oh,” the little boy answered, with his head down. He thought for a moment, looked up and said, “Daddy, could you lend me ＄10?”

    The father was furious, “If you asked for the money to buy a toy or some other rubbish, go straight to your room and think about why you are so selfish (自私)！”

    The little boy went to his room with no words and shut the door. After a short while, the father calmed (平静) down, and started to think, “Maybe he really needs to buy something and he didn't really ask for money very often.” So he went to the little boy's room.

    “Sorry！Maybe I was too hard on your just now.” said the man, “Here's ＄10.”

    “Oh, thank you Daddy！” he said happily. Then the boy took out some coins. When the father found that the boy already had money, he got angry again.

    “Why do you want more money since you already have some?” the father shouted angrily.

    “Because I didn't have enough, but now I do.” The little boy replied, “Daddy, I have ＄20 now. Can I buy one hour of your time? Please come home early tomorrow. I would like to have dinner with you. ”

    A new Magic Bench designed by Disney Research lets you interact (互动) with lovely animated (动画的) character—and no special glasses or earphones are required. Instead, the complete environment-the seat, the sitter and the cartoon characters-is mirrored on a screen opposite the bench making it possible for others to watch the scene unfold.

    How does the illusion work? A camera and sensor catch images and gather depth information about physical objects the bench and the person. And then computer translates them into the 3D animations. Meanwhile sensors of touch built into the bench deliver shaking that is happening at the same time and speed to animated actions on the screen, creating the illusion that the animated figures are occupying real-world space next to the user.

    "Our goal for this project was: hear a character coming, see them enter the space, and feel them sit next to you," said Moshe Mahler, principal digital artist at Disney Research. Unlike the traditional mobile technology, one of whose limitations is that only a single user can see its illusion, the Magic Bench allows groups of people to gather in a single environment and collectively participate in an augmented—reality (扩充实境) experience, all at the same time.

    In a video show, a small cartoon donkey runs into view and kicks the bench, causing sharp sound and making the seated person jump in surprise. Another test shows two people on the bench, reacting as they feel an animated rabbit skip up beside them and jump up and down. When a user passes his hand over the rabbit, a shadow moves across its head, as though it were occupying the same physical space as the person next to it.

    Google, hoping to put down a protest by employees upset that the technology they were working on could be used for deadly purposes, will not renew a contract with the Pentagon(五角大楼) for artificial intelligence work when a current deal expires next year.

    Diane Greene, who is the head of the Google Cloud business that won a contract with the Pentagon's Project Maven, said during a weekly meeting with employees Friday that the company was backing away from its AI work with the military, according to a person familiar with the discussion but not permitted to speak publicly about it.

    Google's work with the Defense Department on the Maven program, which uses artificial intelligence to interpret video images and could be used to improve the targeting of drone strikes, riled the internet giant's workforce.

    About 4,000 Google employees signed a petition(请愿书) demanding "a clear policy stating that neither Google nor its contractors will ever build warfare technology," and a handful of employees resigned in protest.

    The money for Google in the Project Maven contract was never large by the standards of a company with profit of $110 billion last year — $9 million, one official told employees, or a possible $15 million over 18 months, according to an internal email.

    But some company officials saw it as an opening to much greater revenue down the road. In an email last September, a Google official in Washington told colleagues she expected Maven to grow into a $250 million-a-year project, and eventually it could have helped open the door to contracts worth far more.

World Book Day, also known as World Book and Copyright Day, is an annual event organized by the UNESCO to promote reading, publishing and copyright. The first World Book Day was celebrated in Spain on April 23 in 1995. Let's take a look at the world's fascinating libraries and enjoy the fun of reading.

Royal Portuguese Cabinet of Reading

Located in the center of Rio de Janeiro, Brazil, the Royal Portuguese Cabinet of Reading is a library and cultural institution. It was built in the late 19th century under the stewardship of an association of Portuguese migrants. Open to the public since 1900, the cabinet has the largest collection of Portuguese literature outside Portugal, holding more than 350,000 books.

Stuttgart City Library

Stuttgart City Library is a cube outside with a hollow design inside. The hollow part is connected with misplaced stairs to create a unique sense of space. Since its completion in 2011, it has become a local cultural card and a "instagrammable" place for many tourists in Germany .

Wormhole Library

Located in Haikou, South China's Hainan province, the symbolic and artistic Wormhole Library, completed in 2021, provides the public with an ideal spot for reading and resting. It has a reading space that can hold around 10,000 books and has a multifunctional audio-visual area, as well as leisure areas such as cafes, baby care rooms, a common room and a rooftop garden.