Tom goes everywhere with Catherine Green, a 54-year-old secretary. He moves around her office at work and goes shopping with her. "Most people don't seem to mind Tom," says Catherine, who thinks he is wonderful. "He's my fourth child," she says. She may think of him and treat him that way as her son, buying his food, paying his health bills and his taxes, but in fact Tom is a dog.

    Catherine and Tom live in Sweden, a country where everyone is expected to lead an orderly life according to rules laid down by the government, which also provides a high level of care for its people. This level of care costs money.

    People in Sweden pay taxes on everything, so aren't surprised to find that owning a dog means yet more taxes. Some people are paying as much as 500 Swedish kronor in taxes a year for the right to keep their dog, money that is spent by the government on dog hospitals and sometimes medical treatment for a dog that falls ill. However, most such treatment is expensive, so owners often decide to offer health and even life premium for their dog.

    In Sweden dog owners must pay for any damage their dog does. A Swedish Kennel Club official explains what this means: if your dog runs out on the road and gets hit by a passing car you, as the owner, have to pay for any damage done to the car, even if your dog has been killed in the accident.

    Tulips(郁金香) are the national flower of Iran and Turkey. The European name for the flower is a misuse of the Persian word for turban(头巾), a mistake probably arising in the common Turkish custom of wearing flowers in the folds of the turban. Alternatively, the misuse may have arisen because this eastern flower, when not yet in full bloom, looks like a turban. In Persia, to give a red tulip was to declare your love for someone. The black center of the red tulip was said to represent the lover's heart, burned to a coal by love's passion.

    Originally growing in the Ottoman Empire (present-day Turkey), tulips were imported into Holland in the sixteenth century. When Carolus Clusius wrote the first major book on tulips in 1592, they became so popular that the tulips in his garden were stolen from time to time. As the Dutch Golden Age grew, so did this colorful flower. They were commonly seen in paintings and at festivals. In the mid-seventeenth century, tulips even created the first economics bubble（泡沫经济）, known as "Tulip Mania". At that time, tulips were so expensive that they were used as money until the market for them crashed.

    Today, Holland is still known for its tulips and other flowers, often sincerely called "the flower shop of the world." Tulips are planted in great fields of beautiful color, and transform the landscape into a sea of different colors. Tulip festivals are held throughout the country in spring. However, the most well-known tulip festival is organized in the Noordoostpolder, a province in the central Netherlands, each year. Held in the middle of the tulip fields, this flower festival runs from late April to early May. The Dutch people took their love of tulips abroad when they settled, and tulips and tulip festivals are now found in New York and Michigan, where the connection to their Dutch roots is still very strong.

    Spending as little as $ 5 a day on someone else could significantly boost happiness, the team at the University of British Columbia found.

    Their experiments on more than 630 Americans showed they were measurably happier when they spent money on others—even if they thought spending the money on themselves would make them happier.

    "We wanted to test our theory that how people spend their money is at least as important as how much money they earn，" said Elizabeth Dunn，a psychologist at the University of British Columbia. They asked their 600 volunteers first to rate their general happiness，report their annual income and detail their monthly spending including bills, gifts for themselves, gifts for others and donations to charity.

    "No matter how much income each person made，those who spent money on others reported greater happiness, while those who spent more on themselves did not，" Dunn said in a statement.

    Dunn's team also surveyed 16 employees at a company in Boston before and after they received an annual profit sharing bonus of between $ 3, 000 and $ 8, 000. "Employees who devoted more of their bonus to pro­social spending experienced greater happiness after receiving the bonus, and the manner in which they spent that bonus was a more important predictor of their happiness than the size of the bonus itself，" they wrote in their report, published in the journal Science.

    They gave their volunteers $ 5 or $ 20 and half got clear instructions on how to spend it. Those who spent the money on someone or something else reported feeling happier about it.

    "These findings suggest that very minor changes in spending allocations—as little as $ 5—may be enough to produce real gains in happiness on a given day，" Dunn said.

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    A single dose(剂量) of an experimental vaccine(疫苗) can protect mice against the Zika(寨卡) virus, raising renewed hope of a vaccine for humans, say scientists. The US team say the results, published in Nature, are "striking" and should encourage research efforts.

    Tests in humans could begin in months. But even if these go well, a licensed vaccine for widespread use to protect those at most risk ­ such as pregnant women ­ would still be years away, experts advise. Zika has been spreading across Central and South America and, most recently, Africa. More than 60 countries and territories now have continuing transmission(传播) of the disease, which is carried by mosquitoes. The virus causes serious birth damages during pregnancy and has been declared a global public health emergency.

    Now, developing a vaccine for pregnant women to protect their unborn babies is an international research priority(优先事项). US scientists from the Walter Reed Army Institute of Research, the Beth Israel Deaconess Medical Center and Harvard Medical School tested two types of Zika vaccine in mice – one based on bits of genetic(基因的) code from the virus and another that is an inactive (and therefore harmless) copy of Zika. Both worked well, protecting every mouse that was immunised against the virus. In comparison, all of the mice not given the vaccine caught Zika after they were exposed to it.

    Researchers say they will push ahead with developing the needed virus vaccine. There are many existing vaccines for other disease that use this type of technology, while there are relatively few DNA­based vaccines. Of course, future tests will need to check the vaccine is safe and effective in humans, as well as how long the immunity might last.

Ken was my best friend for 30 years. I told him I would leave Chicago for Philadelphia to receive a new job there. "What do you mean you're leaving?" Ken asked angrily. "When did you interview for a job in another city? You had never told me before." I explained that was the new company's rule. "Like you couldn't tell me?" he asked. "I thought our friendship meant more to you than that." "I'm sorry," I said. But I would never give up the job because of friends.

Ken and I had met in a church. Then Ken was a college student studying mental health and I was working in a company. I found we both grew up in small towns and struggled for school life. He often volunteered in Thailand during school holidays. And I once worked there for five years. Talking with Keri gave me great pleasure. Gradually, our conversations even involved in deeper subjects, like our dreams.

I was older than Ken. When he married Lee, I gave him advice about marriage. By that time, I was running a television production business, and was under a lot of stress. It was Ken who encouraged me and helped me get through the hard time. He was a great guy. Even so, I didn't change my mind.

Anyway, when leaving Chicago, Ken and Lee had a warm farewell (告别) party. But we didn't talk much later. After September 2012, everything changed. It started with a letter from Ken: Lee had cancer. Unfortunately, I got divorced (离婚) later and everything was a mess.

In February 2013,I flew to Chicago to see Ken and Lee. We talked. I found there was no one I had ever been able to talk to quite like Ken. I needed to be there for Ken in any way I could. This friendship mattered more than work. When going back to Philadelphia, I left my job and bought a plane ticket that would mean a lot to the rest of my life.