Computers have beaten human world champions at chess and, earlier this year, the board game Go(围棋). So far, though, they have struggled at the card table. So we challenged one AI(artificial intelligence) to a game.

Why is poker so difficult? Chess and Go are “information complete” games where all players can see all the relevant information. In poker, other players' cards are hidden, making it an “information incomplete” game. Players have to guess opponents' hands from their actions—-tricky for computers. Solving poker could lead to many breakthroughs, from cyber security to driverless cars.

    Scientists believe it is only a matter of time before AI once again vanquishes humans, so our human-machine match comes up in a game of Texas Hold's Em Limit Poker. The AI was developed by Johannes Heinrich, a researcher studying machine learning at UCL. It combines two techniques: neural(神经的)networks and reinforcement learning(强化学习).

    Neural networks, to some degree, copy the structure of human brains: their processors are highly interconnected and work at the same time to solve problems. They are good at spotting patterns in huge amounts of data. Reinforcement learning is when a machine, given a task, carries it out, learning from mistakes it makes. In this case, it means playing poker against itself billions of times to get better.

    Mr Heinrich told Sky News: “Today we are presenting a new procedure that has learned in a different way, more similar to how humans learn. In particular, it is able to learn abstract patterns, represented by its neural network, which allow it to deal with new and unseen situations.”

    After two hours of quite defensive play, from the computer at least, we called it a draw.

    Have you ever considered all the English expressions that include words about clothes? Let's have a look.

    People wear pants to cover the lower part of their bodies. We sometimes say that people who are nervous have ants in their pants. Sometimes, people may get caught with their pants down. They are found doing something they should not be doing. And, in every family, one person takes control. Sometimes a wife tells her husband what to do. Then we say she wears the pants in the family.

    Pants usually have pockets to hold things. Money that is likely to be spent quickly can burn a hole in your pocket. Sometimes you need a belt to hold up your pants. If you have less money than usual, you may have to tighten your belt.

    I always praise People who can save their money and not spend too much. I really take my hat off to them. Yet, when it comes to my own money, I spend it at the drop of a hat, which means I instantly spend it.

    Boots are a heavy or strong kind of shoes. People who are too big for their boots think they are more important than they really are. I dislike such people.

    My father is an important person. He runs a big company. He wears a suit and tie, and a shirt with sleeves that cover his arms. Some people who do not know him well think he is too serious and never shows his feelings openly. But I know that my father wears his heart on his sleeve.

    According to Guglielmo Cavallo and Roger Chartier, reading aloud was a common practice in the ancient world, the Middle Ages, and as late as the sixteenth and seventeenth centuries. Readers were “listeners attentive to a reading voice,” and “the text addressed to the ear as much as to the eye.” The significance of reading aloud continued well into the nineteenth century.

    Using Charles Dickens's nineteenth century as a point of departure, it would be useful to look at the familial and social uses of reading aloud and reflect on the functional change of the practice. Dickens habitually read his work to a domestic audience or friends. In his later years he also read to a broader public crowd Chapters of reading aloud also abound in Dickens's own literary works. More importantly, he took into consideration the Victorian practice when composing his prose, so much so that his writing is meant to be heard, not only read on the page.

    Performing a literary text orally in a Victorian family is well documented. Apart from promoting a pleasant family relationship, reading aloud was also a means of protecting young people from the danger of solitary (孤独的) reading. Reading aloud was a tool for parental guidance. By means of reading aloud, parents could also introduce literature to their children, and as such the practice combined leisure and more serious purposes such as religious cultivation in the youths. Within the family, it was commonplace for the father to read aloud Dickens read to his children: one of his surviving and often-reprinted photographs features him posing on a chair, reading to his two daughters.

    Reading aloud in the nineteenth century was as much a class phenomenon as a family affair, which points to a widespread belief that Victorian readership primarily meant a middle-class readership, Those who fell outside this group tended to be overlooked by Victorian publishers。Despite this, Dickens, with his publishers Chapman and Hall, managed to distribute literary reading materials to people from different social classes by reducing the price of novels. This was also made possible with the technological and mechanical advances in printing and the spread of railway networks at the time.

    Since the literacy level of this section of the population was still low before school attendance was made compulsory in 1870 by the Education Act, a considerable number of people from lower classes would listen to recitals of texts. Dickens's readers, who were from such social backgrounds, might have heard Dickens in this manner. Several biographers of Dickens also draw attention to the fact that it was typical for his texts to be read aloud in Victorian England, and thus illiteracy was not an obstacle for reading Dickens. Reading was no longer a chiefly closeted form of entertainment practiced by the middle class at home.

    A working-class home was in many ways not convenient for reading: there were too many distractions, the lighting was bad, and the home was also often half a workhouse. As a result, the Victorians from the non-middle classes tended to find relaxation outside the home such as in parks and squares, which were ideal places for the public to go while away their limited leisure time. Reading aloud, in particular public reading, to some extent blurred the distinctions between classes. The Victorian middle class defined its identity through differences with other classes. Dickens's popularity among readers from the non-middle classes contributed to the creation of a new class of readers who read through listening.

    Different readers of Dickens were not reading solitarily and “jealously,” to use Walter Benjamin's term. Instead, they often enjoyed a more communal experience, an experience that is generally lacking in today's world. Modem audiobooks can be considered a contemporary version of the practice. However, while the twentieth- and twentieth-first-century trend for individuals to listen to audiobooks keeps some eharacteristics of traditional reading aloud-such as “listeners attentive to a reading voice” and the ear being the focus—it is a far more solitary activity.

    Reading may be fundamental, but how the brain gives meaning to letters on a page has been a mystery. Two new studies fill in some details on how the brains of efficient readers handle words. One of the studies, published in the April 30 Neuron, suggests that a visual-processing area of the brain recognizes common words as whole units. Another study, published online April 27 in PLOSONE, makes it known that the brain operates two fast parallel systems for reading, linking visual recognition of words to speech.

    Maximilian Riesenhuber, a neuroscientist at Georgetown University in Washington, D. C. , wanted to know whether the brain reads words letter by letter or recognizes words as whole objects. He and his colleagues showed sets of real words or nonsense(无意义的词语)words to volunteers undergoing FMRI scans. The words differed in only one letter, such as “farm” and “form” or “soat” and “poat”, or were completely different, such as “farm” and “coat”or “poat” and “hime”.The researchers were particularly interested in what happens in the visual word form area, or VWFA, an area on the left side of the brain just behind the ear that is involved in recognizing words.

    Riesenhuber and his colleagues found that neurons(神经元)in the VWFA respond strongly to changes in real words. Changing “farm” to “form”, for example, produced as great a change in activity as changing “farm” to“coat”, the team reports in Neuron. The area responded slowly to single-letter changes in made-up words.

    The data suggests that readers grasp real words as whole objects, rather than focusing on letters or letter combinations. And as a reader's exposure to a word increases, the brain comes to recognize the shape of the word. “Meaning is passed on after recognition in the brain”, Riesenhuber says.

    The researchers don't yet know how longer and less familiar words are recognized, or if the brain can be trained to recognize nonsense words as a unit.

The Gift of Life

    Most couples demonstrate their love on February 14 with flowers or chocolates. But these four men and women have offered the ultimate loving gesture—the gift of life. Each sacrifice has enabled their loved ones to live full and active lives again after serious illness.

    I'D Do THE SAME FORHER

    Michele Johnson, 53, has been married to Gay, 57, for 26 years.

    With her husband suffering from a congenital(先天性的)kidney condition, in 2013 Michele  gave him one of him. Gay said: “I needed to be hooked up to a dialysis(透析)machine. I had no quality of life at all. However, I felt great as soon as I woke up after the operation. I told her I'd do the same for her.”

    I LOVE BRENDA TO BITS

    Brenda Green, 62, met her husband Keith, 63, when she was 24 and they married five years later. When Brenda was told five years ago she needed a kidney transplant, she cried. I Ⅱ give you mine.” Keith said without hesitation. “Brenda is my wife and I love her to bits.”

    MY WIFE'S MY HERO

    Stephen Heavyside, 61, and wife Patricia, 62, have been married for 40 years. Stephen said: “I was diagnosed with adult polycystic kidney disease five years ago. Patricia took good care of me and donated a kidney. This has brought us even closer.”

    He said “Patricia's gift changed my life. She is my hero.”

    DECISION WAS EASY

    Anna Stevens, 48, and husband Gary, 53, of Watford, Herts, have been wed for 23 years. Anna donated a kidney to her husband. She said of the transplant: “It was the easiest decision I've ever made.” Gary said. “There's only two words that I can use to describe her:  My angel.”