A new study finds that young females in one group of African chimps(黑猩猩) use sticks as dolls more than their male peers (同龄) do, often treating pieces of wood like a mother chimp caring for a baby. In human cultures around the world, girls play with dolls and pretend that the toys are babies far more than boys do.

    Chimp observations, collected over 14 years of field work with the Kanyawara chimp community in Kibale National Park in Ugandan, provide the first evidence of a nonhuman animal in the wild that exhibits sex differences in how it plays. This finding supports an argument that biology as well as society underlies boys' and girls' different toy preferences.

    Stick play occurred most commonly between ages 3 and 9. Females spent a lot more time carrying sticks than males did. Young male chimps occasionally used sticks to mimic(模仿) childcare. "Far more often, they fought with sticks, an infrequent behavior among females," say Sonya Kahlenberg of Bates College in Lewiston, Maine, and Richard Wrangham of Harvard University.

    "Biological differences between the sexes make female chimps more receptive to stick-mothering than males," says Wrangham.

    Consistent with reported cultural traditions among adult chimps, Kanyawara youngsters learned from each other to play with sticks as if caring for babies. Stick play among young chimps showed no evidence of being directly influenced by older chimps. Child-bearing females never played with sticks and thus didn't model such behavior for younger chimps.

    Young females carried sticks for anywhere from a few minutes to several hours. They often rested in nests with their sticks, sometimes playing with them much as chimp mothers play with their babies though they didn't get any form of teaching from the adults.

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    One time a young man, who hoped to study law, wrote to Lincoln for advice, and Lincoln replied, "If you are determined to make a lawyer of yourself, the thing is more than half done already. Always bear in mind that your own determination to succeed is more important than any other one thing."

    Lincoln knew. He had gone through it all. He had never, in his entire life, had more than a total of one year's schooling. And books？Lincoln once said he had walked to borrow every book with in fifty miles of his home. A fire was usually kept going all night in the small house and he read by the light of it.

    He walked twenty or thirty miles to hear a speaker and, returning home, he practiced his talks everywhere﹣in the fields, in the woods, before the crowds. He joined several societies and practiced speaking on the topics of the day.

    A lack of confidence always troubled him. In the presence of women he was shy and dumb. Even when he was in love with Mary Todd, he used to sit there, nervous and silent, unable to find words, listening while she did the talking. Yet that was the man who, by practice and home study, made himself into the speaker who debated with the famous speaker Douglas! That was the man who, in Gettysburg address, rose to the heights of eloquence （雄辩） that have seldom been achieved in all the human history.

    Small wonder that, speaking of his own great barriers and painful struggle, he wrote, "If you are determined to make a lawyer of yourself, the thing is more than half done already."

    My grandmother often said to me, "You can count the number of your true friends on the fingers of one hand." For a long time I thought this was true. However, I've now discovered my grandmother was only half right. Maybe we do only make a few "best" friends in our lifetime, but those aren't the only people that we can call friends. There are many different types. Let me tell you about a few of them.

    One type of friends is the type I call the "football mom friends". My neighbour Sally is a good example. We both have kids who play football in a football club, and someone has to take them to practise and pick them up. Sally and I and two other mothers do this. We meet sometimes and have tea and talk about what our kids are doing, but those are the only times that we meet each other. I enjoy being with these women, but we don't do anything else together.

    Another type is called the "hobby friend". That's the person you share an interest or a hobby with. Michael and Cater, who are brothers, are a good example of this type. We're all in a bird watching club. Every few weekends the members of the club go on a trip to watch different kinds of birds. There's nothing romantic about my relationship with Michael and Cater, of course. We just share interest in birds.

    Then there's the "other half the couple" type of friends. Jim is married to Rose, a friend that I have known since college. When Rose married Jim, I realized that I would have to be Jim's friend if I want to continue to be Rose's. Jim and I don't share so many interests, but we do have a friendly relationship.

The Greatest show on Earth

    The Olympic Games are the greatest festival of sports in the world. Every four years, many countries send their best sportsmen to compete for the highest honour in sport. As many as 6, 000 people take part in over 20 sports. For the winners, there are gold medals and glory. But there is honour, too, for all who compete, win or lose. That is in the spirit of the Olympics—to take part is what matters.

    The Olympic Games always start in a bright colour and action. The teams of all the nations parade in the opening ceremony and march round the track. The custom is for the Greek team to march in first, for it was in Greece that the Olympics began. The team of the country where the Games are being held—the host country—marches in last.

    The runner with the Olympic torch (火炬) then enters the stadium and lights the flame. A sportsman from the host country takes the Olympic oath (宣誓) on behalf of all the competitors. The judges and officials also take an oath. After the sportsmen march out of the stadium, the host country puts on a wonderful display.

    The competitions begin the next day. There are usually more than twenty sports in the Games. The rule is that there must be at least fifteen. The main events are in track and field, but there are a few days before these sports start. Each day the competitors take part in different sports, like riding, shooting, swimming, and cross-country running. Points are gained for each event. Medals are awarded for the individual winners and for national teams.

    More and more women are taking part in the Games. They first competed in 1900, in tennis and golf. Women's swimming events were introduced in 1912. But it was not until 1928 that there were any track and field events for women. Now they compete in all but half a dozen of the sports. In horse riding, shooting, and boat racing, they may compete in the same events as men.

The urgency and importance of Covid-19 over (he past year have driven almost everything else from most leaders5 minds. But since the vaccine is kicking in, Britain's government is once again beginning to think about the things that will matter later. Next week, it is expected to publish a 'plan for growth" to boost productivity, with innovation at its centre.

The world may be on the point of a technological boom with life sciences, at which Britain excels. Innovation is crucial to productivity, but on this front Britain's performance has lagged behind its competitors' in recent years. Its low spending on Research and Development (R&D) argues for a boost. Those who attributed the financial failure in the 1970s to the insufficiency of research funds may regard this as a threat to economic growth. Promoting innovation can quickly (um into an exercise in picking winners - or, as is more often the case, losers.

A second danger is that policy agendas get mixed up. The government has promised to "level up" poorer areas of the country, so deprived towns arc campaigning for more money for their universities. But trying to boost innovation by sending money to weak institutions is likely to make our leading universities lose their advantages, thus producing average ideas that could have been remarkable. Britain's research-funding system has always been elitist(精英主义的). It should stay that way.

The government's first move in boosting innovation was the announcement of a plan for an Advanced Research and Invention Agency (ARIA). ARlA's purpose is to fund high-risk, high-reward research. But money is not all that mailers. The successful translation of life science research into treatments during the pandemic suggests some inexpensive measures that can also make a difference.

One is to speed up governmental processes. The rapidity with which Britain's medical regulator moved during the pandemic is one reason why the vaccine rollout is racing through the population. Urgency is not unique lo pandemics. Getting things done quickly can make an investment worthwhile and determine where a businessman chooses as a base.

Another useful measure the government should use is its unique ability to overcome barriers. At the beginning of the pandemic. Covid-19 researchers were unable to gain access to different strands of health service data. The government eased restrictions on existing data and allowed researchers to ask people who had tested positive tor Covid-19 to join trials. Both were crucial to the effort.

A last principle is the value of connections between the government and the private sector. Kate Bingham, a venture capitalist who led the vaccine-purchase effort, understood how to deal with drug companies. Many of the civil servants working with her had commercial experience. The governments closeness to business during the pandemic has been criticized. But without it, the vaccine effort would not have succeeded.

Innovation took human beings from caves to computers. Good education, a welcoming immigration policy and a friendly business environment will do most to tend it. But a new sensible principles can help keep the flame burning.