My friend's grandfather came to America from a farm in Thailand. After arriving in New York, he went into a cafeteria(自助餐厅) in Manhattan to get something to eat. He sat down at an empty table and waited for someone to take his order. Of course nobody did. Finally, a woman with a big plate full of food came up to him. She sat down opposite him and told him how a cafeteria worked.

    “Start out at that end,” she said, “Just go along the line and choose what you want. At the other end they'll tell you how much you have to pay.”

    “I soon learned that's how everything works in America,” the grandfather told my friend later, “Life's a cafeteria here. You can get anything you want as long as you want to pay the price. You can even get success, but you'll never get it if you wait for someone to bring it to you. You have to get up and get it yourself.”

    Believe it or not, the size of the human brain has become smaller over the past 20,000 years. Scientists argue over whether this means we are becoming more or less intelligent as a species.

    “I'd call that a major downsizing in an evolutionary eye blink (眨眼),” John Hawks told Discover magazine.

    Why is the brain becoming smaller?

    There are different theories to explain it. One is that tens of thousands of years ago, before the decline began, to survive in cold and dangerous conditions, humans needed a stronger and larger body and therefore, a larger head. Also they had to chew the tough meat of rabbits, foxes and horses. As conditions improved, the brain stopped growing, according to supporters of this theory.

    Another theory comes from a recent study by David Geary and Drew Bailey. They found that brain size decreased as population density(密度) increased.

    “As complex societies appeared, the brain became smaller because people did not have to be as smart to stay alive.” Geary told AFP.

    But smaller brain size does not necessarily mean that modern humans are less smart than their ancestors. “Modern humans simply developed different, more complex forms of intelligence,” said Brian Hare.

    Hare's studies focus on two types of great apes: chimpanzees and bonobos. Both are much like humans, but are physically quite different from one another. The bonobo has a smaller brain than the chimpanzee, and is also much less aggressive and more tolerant.

    “When it comes to working out a problem,” Hare said, “chimpanzees are much less likely to accomplish it if it involves working together. Not so with bonobos.”

The smaller brain in modern humans may be evidence that we can cooperate,” Hare told the US National Public Radio.

    Nations in the UN have agreed that the world needs to completely stop plastic waste from entering the oceans. The UN resolution(决议) has no timetable. But ministers at an environment summit believe it will set the course for much tougher policies and send a clear signal to business.

    Under the resolution, governments would establish an international task force(特遣小组) to advise on fighting what the UN's oceans chief has described as a world crisis. One controversial issue is the wish to include businesses on the global task force. Ministers say the problem will not be solved without business, but green groups point out that some firms in the plastics industry have been against restrictions for decades. Vidar Helgesen, a leading voice in the talks, told BBC News, “Business is listening to markets and seeing how marine litter(海洋垃圾) is a growing popular concern. It's possibly the fastest－growing environmental problem and it's therefore a fast－growing problem for business. We need to bring on board those companies that want to change things, and then look at taxes and regulations to make more companies act.”

    Certainly, there has been resistance from plastics firms to the bans. One UN delegate, who did not want to be named, stated that journalists in some countries were being paid by the plastics industry to write stories about job losses following the plastic bag ban. But they did not mention the jobs being created in alternatives, such as labour－intensive basketwork, which provides work for the rural poor. But some governments are standing firm, and the meeting has witnessed individual nations declaring tougher action against single－use plastic bags.

    The UN's spokesman Sam Barratt told BBC News, “Of course we would have liked to have gone further, but this meeting's made real progress. There's now a sense of urgency and energy behind the issue that we haven't quite seen before. What is obvious, though, is that the UN can't solve this problem on its own. We need to do it in partnership with governments, businesses and even individuals.”

    Since 2013,Torobo, a robotic are designed to test the limits of artificial intelligence, has had one ambition—to be admitted to the University of Tokyo, one of Asia's top-ranked educational institutions. Although equipped with an extensive database of textbooks and other teaching materials, Torobo has repeatedly failed to obtain the university's required minimum 80% score in the National Center Test, a yearly standardized entrance examination adopted by Japanese universities. This year was no exception.

    In early November, Torobo, along with millions of Japanese high school students, took a mock(模拟的)exam to prepare for the all-important standardized test.

    Torobo's total score of 525 out of 950, which was higher than the national average, was enough for it to get admitted to many other influential Japanese universities.

    However, its standard score of 57.1%, though 14 points higher than in 2015, still fell short of the minimum required for the University of Tokyo.

    A closer analysis of the results showed that Torobo was able to draw from its database to solve knowledge-based questions and ones involving complex mathematical calculations, but it had a hard time thinking independently, failing to comprehend multiple sentences and phrases to arrive at the logical conclusions. This weakness was reflected in its shabby English scores.

    Fortunately, the robot's creators have decided to free Torobo from its four-year sufferings. Noriko Arai, professor of the University of Tokyo who heads the team, says, “From the present results, we are able to evaluate the possibilities and limits of artificial intelligence. From now on, we will grow its abilities in the fields where it is doing well and aim to improve them to levels that can be applied in industry.” So while Torobo will never graduate from the University of Tokyo, it can still look forward to a bright future!

    Donna Strickland is a professor in the Department of Physics and Astronomy. Professor Strickland is one of the recipients( 受领者) of the Nobel Prize in Physics 2018 with Gérard Mourou, her PhD supervisor at the time. They published this Nobel-winning research in 1985 when Strickland was a PhD student at the University of Rochester in New York state. Together they paved the way toward the most intense laser pulses ever created.

    Professor Donna Strickland is only the third woman ever to have won a Nobel Prize in physics. She and her fellow winners were honored for what the Nobel Committee called ground-breaking inventions in laser physics. Professor Strickland devised a way to use lasers as very precise drilling or cutting tools. Millions of eye operations are performed every year with these sharpest of laser beams.

—"How surprising do you think it is that you're the third woman to win this prize? "

—"Well, that is surprising, isn't it? I think that's the story of Maria that people want to talk about — that why should it take 60 years? There are so many women out there doing fantastic research, so why does it take so long to get recognized? "

    Physics still has one of the largest gender gaps in science. One recent study concluded that at the current rates it would be more than two centuries until there were equal numbers of senior male and female researchers in the field.

    The last woman to win a physics Nobel was German-born Maria Goeppert-Mayer for her discoveries about the nuclei of atoms. Before that it was Marie Curie, who shared the 1903 prize with her husband, Pierre. This year's winners hope that breaking this half century hiatus will mean the focus in future will be on the research, rather than the gender of the researcher.

My dearest daughter,

    As I looked across at you sitting on the sofa watching The X Factor, I noticed that you are no longer a child, and that having just celebrated your 14th birthday, you are now a young woman starting a journey into becoming an adult woman. As I looked at you, I remembered myself at 14, and the vastly different places we are beginning this journey from.

    Your identity as a mixed-race young woman, with an English father and a Pakistani mother, has already influenced how you place yourself in this world. As yet, you are unaware of the personal struggles that I took at the age of 25 to marry. How it felt when my mother refused to come to my wedding. The sharp criticisms of the Asian community that such marriages do not work out and always end in divorce (离婚). The confidence I had to grow, as we chose to live in a multicultural community, as I refused to be shamed into living in the white suburbs (郊区).

    Then, at the age of 30, I became your mum with all the joys and struggles this brought, as I refused the Asian traditions for a new baby's arrival. From your birth, your life could not have been more different from mine. I was brought up on a council estate (地方政府建的住宅群), within a close extended Muslim family, through which poverty, racism and neglect were mixed. I was never given the freedoms or the opportunity to experience new things. Now, as I hear you play your piano, I am grateful that you have these chances.

    So many doors were closed to me as a young person, and as I fought for small steps of freedom, I soon learned that it was better to do what I wanted without the knowledge of my parents, and so lies and tricks became part of my life too. The pressures to obey, to be a "good Muslim" girl and keep the family honor, were choking. Behind closed doors at home, the neglect and abuse (虐待) took place. It was hidden, I felt the shame, lived with the fear and suffered together with my sister and two younger brothers. Oh, the power we thought our parents had over us! I was convinced that one day my father would indeed beat us so hard that leaving us for dead, he would, as his threats said he would, bury us in the large back garden, and tell the school he had taken us back to Pakistan for good. My sister and I longed for a different blue sky to live under.

    As a daughter of immigrant (移民) parents, I carried their hopes of a better education for their children—my own veins (血管) pulsing with the hard-work ethic (道德) and need to be grateful for the opportunity of a free education. And it was education that provided me with the strength to find my own blue sky. I fought to leave home to go to university at the age of 18, and never returned to live with my parents again.

    Now as you explore your mixed-race heritage, which I hope we have supported you to do with visits to Pakistan and ensuring you go to multi-cultural schools, I want you to take the very best of all that is Asian with you as you become a woman.

    The struggles of identity (身份) and belonging will come but I hope that we have given you a strong foundation from which to explore these struggles. All the chances and freedoms that I only dreamed of as a young woman, I have offered you. I have chosen a different path of loving you as my daughter, with an unconditional love that many consider "western".

    I want you to know that although your journey has been vastly different, I am excited as I watch you standing on the threshold (门槛) of becoming a woman for all the adventures and possibilities the future holds for you.

    May you fly your blue sky with grace, confidence and hope as you find your place in this beautiful and crazy world.

    Loving you now and always. Mommy