A German study suggests that people who were too optimistic about their future actually faced greater risk of disability or death within 10 years than those pessimists who expected their future to be worse.

    The paper, published this March in Psychology and Aging, examined health and welfare surveys from roughly 40,000 Germans between ages 18 and 96. The surveys were conducted every year from 1993 to 2003.

    Survey respondents (受访者) were asked to estimate their present and future life satisfaction on a scale of 0 to 10, among other questions.

    The researchers found that young adults (age 18 to 39) routinely overestimated their future life satisfaction, while middle-aged adults (age 40 to 64) more accurately predicted how they would feel in the future. Adults of 65 and older, however, were far more likely to underestimate their future life satisfaction. Not only did they feel more satisfied than they thought they would, the older pessimists seemed to suffer a lower ratio (比率) of disability and death for the study period.

     “We observed that being too optimistic in predicting a better future than actually observed was associated with a greater risk of disability and a greater risk of death within the following decade,” wrote Frieder R. Lang, a professor at the University of Erlangen-Nuremberg.

    Lang and his colleagues believed that people who were pessimistic about their future may be more careful about their actions than people who expected a rosy future.

     “Seeing a dark future may encourage positive evaluations of the actual self and may contribute to taking improved precautions (预防措施),” the authors wrote.

    Surprisingly, compared with those in poor health or who had low incomes, respondents who enjoyed good health or income were associated with expecting a greater decline. Also, the researchers said that higher income was related to a greater risk of disability.

    The authors of the study noted that there were limitations to their conclusions. Illness, medical treatment and personal loss could also have driven health outcomes.

    However, the researchers said a pattern was clear. “We found that from early to late adulthood, individuals adapt their expectations of future life satisfaction from optimistic, to accurate, to pessimistic,” the authors concluded.

    Hot spots of drones (无人机) in Australia are getting sensors to automatically identify the aircraft and their pilots. Australia's Civil Aviation Safety Authority (CASA) said it would fix the equipment at the nation's airports starting next month. The monitors have been planned for some time, but come in the wake of 72 hours of drone-related disorder at the UK's Gatwick airport last week.

    In 2019, Australia will also start a scheme to register drone owners. The UK is also due to introduce a scheme in November that will require recreational drones weighing 250g (0.55lb) or more to be registered.

    Almost 140,000 air travellers were delayed last week after reports of drone sightings caused huge delays at Gatwick Airport. UK police are still searching for the criminals, although they have also raised the possibility that witness reports of the aircraft were mistaken. The incident “highlights” the need for a drone-spotting capability (能力), CASA spokesman Peter Gibson told the news agency Agence France-Presse. The supervision system would be able to spot the types of drone being flown, read their serial numbers and work out where the pilot was located, he said. Efforts to identify pilots would be aided by the introduction of the registration scheme for commercial and casual drone owners, he added. “2019 will witness severe action towards drone safety,” said Mr. Gibson. As well as airports and other sensitive locations, the drone-spotting systems will be fixed in other places known to be popular with drone owners such as the Sydney Harbour Bridge.

    Authorities in Australia have expressed worries about the number of drones being flown in controlled areas in recent months. Anyone breaking rules could face fines of up to 10,000 Australian dollars ($7,058; £5,600) as well as checks on the safety of their craft. “In 2019 it could be very expensive doing the wrong thing with your drone,” said Mr. Gibson. Events at Gatwick were discussed by ministers in a Christmas Eve phone conference. It is understood that the Cabinet Office “pushed” the Ministry of Defence and the Home Office to update their relevant regulations. They also discussed defence systems across the UK's airports.

    As free as they make us, mobile phones still need to stay close to a power source. Soon that may change with "green" power.

    Three Chilean students got the idea for a plant-powered device(装置) to charge（使……充电） their cellphones, while sitting in their school's outdoor courtyard during a break from exams, with dead mobile phones. Then, one of them had an "aha" moment.

    “It occurred to Camila to say about plants,” said inventor Evelyn Aravena. “'Why don't you have a socket, if there are so many plants? 'After that, we thought, 'why don't they have a charging outlet（插座）? Because there are so many plants and living things that have the potential to produce energy, why not?'”

    Their invention—a small biological circuit called E-Kaia—uses the energy plants to produce during photosynthesis(光合作用). A plant uses only a small part of that energy and the rest goes into the soil, and that's where the E-Kaia collects it. The device plugs into the ground and then into your phone.

    "It's the most amazing project I've ever seen in my life, plain and simple. They brought this original model, and it worked — and that's when it all changed, at least from my personal point of view and I began to support them." said Mauricio Cifuentes.

    The device solved two problems for the engineering students — they needed an idea for a class project, and an outlet to plug in their phones.

    "Looking for a place to charge the notebook, which had no power, and the mobile phones, we weren't able to find anything because all the other students were in the same state of madness trying to find a place to charge their devices," said Aravena.

    But plants are everywhere, and the bio－circuit makes good use of their excess(过多的) power.

    The E-Kaia doesn't carry much charge but it's powerful enough to completely recharge a mobile phone in less than two hours.

    The student inventors have applied for patents（专利） on their technology, and expect the E-Kaia to go on sale in the near future.

    It's undeniable that spending time outdoors and in nature lifts our spirits and makes us feel more centered and at peace. When we breathe in fresh air, and enjoy the beauty of trees, streams and oceans, we naturally tend to feel more connected to ourselves and others.

Over the past decade, scientists have been exploring why nature — and dirt specifically — is such a powerful tool in improving our mood. According to researchers, the secret may lie in the microbes (微生物)of the soil. One bacterium specifically—-Mycobacterium Vaccae (M. Vaccae) —has been identified as having the power to affect our moods and cognitive function as well.

    Experiments conducted at Sage Colleges in New York found that contact with M. Vaccae can increase serotonin levels in the brain — a chemical that is associated with higher levels of happiness, increased focus, and reduced anxiety. In order to explore how the bacteria can improve learning, researchers Dory Mathews and Susan Jenks experimented with mice in a maze. Mice that ingested the bacteria navigated the maze twice as fast as the control group and proved less anxious as well.

    Humans can absorb M. Vaccae just by playing in the dirt. We take in it when we breathe, we consume it in organic vegetables, and it can also enter our bloodstream through skin contact, especially where we have open cuts. This may explain why children in school perform better after break.

    Neuroscientist Christopher Lowry at the University of Bristol in England believes that he has identified why this incredible bacterium works. "What we think happens is that the bacteria activate immune cells, which release chemicals called cytokines that then act on receptors on the sensory nerves to increase their activity.”

    Beyond the power of M. Vaceae, scientists have been proving for decades that exposure to dirt, and the huge number of microbes found in dirt, can strengthen our immune system. When our body comes into contact with bacteria, it stores die information in a type of library and can then use that information to fight sickness and infection more effectively.

    Happiness, focus, less anxiety… I'll take a double dose of dirt; please!

    A new mom from Michigan headed for the airport Thursday, nervous about flying alone with her -month-old. When her daughter started crying even before take-off her fears for the flight — to surprise her husband, a US Army soldier at Fort Rucker Alabama — seemed acceptable.

    The couple seated next to her reacted just as Rebekka Garvison had feared, looking visibly unhappy about sitting next to a fussy(难以取悦的)baby. Ms. Garvison moved to a new seat, hoping it would help. When the baby's cries continued, the woman sitting next to her asked if she could try.

    Garvison later described in a grateful Facebook post how the woman, Nyfesha Miller, had the magic touch with her baby. "As soon as she had her, Rylee was looking out the window and stopped crying," Garvison recalled. "When we got in the air she fell right asleep and slept in her lap the whole flight until we got to our gate? Garvison told The Huffington Post she has been in touch with Ms. Miller almost daily since the flight.

    Garvison's post has been shared more than 84,000 times, and received hundreds of warm comments. "Years ago, the same kind of thing happened to me," wrote one mother. "It was a seven-hour flight and I had my ten-month-old little boy with me. A nun （修女）was sitting beside me and she walked him up and down the passage when he got fussy. It was such a relief for me and is something I will never forget."

    Not everyone has had happy experiences with baby air travelers. One airline is considering opening a "baby class" for airplanes with flight attendant nannies（保姆）, reported The Christian Science Monitor's Meredith Hamilton. For now, parents can hope to be seated beside someone like Ms. Miller on their next flight. "Nyfesha Miller, you will never understand how happy this act of kindness has made my family." wrote Garvison.

Candy comes in many flavors. Some taste like fruit. Some taste like flowers. Some are chewy, like taffy (太妃糖) and gum. Hard candies are, well. hard! So, they last a long time.

But, in spoken English, there are some types of candy that you cannot eat. For example, you can't eat eye candy. Eye candy is a person-man or woman-who is very good-looking. So, looking at this person is a treat for the eye, just like candy is a treat for the taste buds.

Do you hear of candy coat? Of course it is not a coat made of candy. But you can say I don't candy coat the truth. What does candy-coating something mean? Well, some pills are covered with a coat of thin, sweet candy. The coating makes swallowing the pill easier, and it may hide a bad taste. So, candy coating a difficult truth or situation means you don't directly discuss its bad parts.

After talking about candy you may want to eat some candies. However, some people dislike things that are very sweet, especially adults. But even if you do not like candy, you can still be called a kid in a candy store. This expression means a person is very happy to do something or to simply be somewhere. Imagine a child going from one candy display to the next, not knowing which candy to choose!

Talking about children brings us to another expression: as easy as taking candy from a baby. Think about a small, helpless baby holding a piece of candy. Taking it would be very easy—mean, but easy. So, use this expression when you are talking about something that may be simple to do, but probably not right.