Life may have evolved on at least three planets within a newly discovered solar system 39 light years from Earth. Astronomers at the NASA have discovered no less than seven roughly Earth-sized worlds orbiting a dwarf star in the system. Scientists had previously identified a tiny number of "exoplanets", which are believed to have the qualities needed to support life. However, the new system contains an unprecedented(前所未有) number of Earth-sized, probably rocky planets, and is being acknowledged as an "accelerated leap forward" in the search for extraterrestrial (外星球的)life.

    Three of the new planets are said to be particularly promising because there might exist oceans. Thomas Zurbuchen, associate administrator of NASA, told a press conference in Washington: "This gives us a hint that finding a second Earth is not a matter of 'if', but 'when'."

    The planets were discovered using NASA's Spitzer Space Telescope, which was able to track how fast each of the planets crossed the star Trappist-l and completed an orbit. From this the research team calculated how far the planets were from their star, and therefore how likely they are to be habitable.

    NASA's Hubble Space Telescope is already being used to search for atmospheres around the planets. Future telescopes, including the proposed European Extremely Large Telescope and the James Webb Space Telescope, may be powerful enough to discover markers of life, such as oxygen in the atmospheres of exoplanets.

    Astronomers believe there could be as many as 40 billion potentially habitable worlds in our galaxy, the Milky Way. Prof Zurbuchen said that now was a "gold-rush phase" in the search for these exoplanets.

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    Sharon, Aged 22

    The most important thing to keep in mind when going into high school is to be yourself. Besides, I don't know what your middle school was like, but high school teachers will not care about things such as how much homework you already have in one night. It's best to just learn to deal with things and manage your time wisely so you can achieve everything you need to.

    Frank, Aged 21

    I think almost every kid feels both nervous and excited before their first day. You will probably love it. I know I did. You should join some sports or activities that will make your high school experience more enjoyable.

    Good luck!

    Eddie, Aged 20

    When I started high school I was really nervous too, especially since I had been homeschooled all through middle school and didn't really know anyone. I suppose the best advice would be to just relax. The first couple of days can be a little bit hard, but things will become easier before you know it.

    David, Aged 19

    I am not going to lie. The first day is kind of frightening. But you'll get used to it. Don't be afraid of anyone; upperclassmen will pick on you more if you let them know you're afraid. Just take it easy. Making some friends and staying with them will greatly help you get used to high school quickly. After the first week it's really not bad at all. Don't worry.

    Lots of people like a good fright at Halloween. Yet, the most frightening thing of all about the night is that twice as many children are killed while out and about on Hallween compared to any other day of the year, according to a study by Safe Kids Worldwide. It can also be a worrying time for others, especially elderly people living alone. Bu many people think it's just harmless fun.

    But is it harmless fun?

    Police forces across Britain are giving warnings about Halloween night. They are asking all those wishing to celebrate Halloween this year to respect those who don't want to join in.

    Some forces, like West Mercia Police, have produced “Sorry, No Trick or Treat” posters which can be downloaded from their website, and put up in windows. They want people to send them to the old or anyone who may be frightened by ghosts(鬼)knocking on their doors.

    A spokesman said: “Children should not call on houses where the posters are put up, neither should they call on strangers, as this can put young people at risk and also make some house owners anxious, especially those who are elderly or living alone.”

    The police want all trick or treaters to remember that disturbing other people or throwing objects at their homes or cars are all criminal offences(刑事罪). “What may start off as a bit of fun could end up with someone getting a criminal record,” they warn. “Parents may want to consider having a Halloween party at home, instead.”

Kent Police are warning young people never to go into the home of someone they don't know—and to remember not to frighten people.

    Warwickshire Police are also warning that tricks may seem like harmless fun but can cause trouble to others. They say behaviour such as throwing eggs can quickly cross the line between being anti-social and causing criminal damage. This can result in fines of ￡2,500 for small offences.

    Whenever we see a button, we are eager to press it because we know something will happen. This is true in most cases, for example on a doorbell and on the "on/off" button on the TV. But some buttons are actually fake, like the "close" button on a lift.

    Many people are in the habit of pressing the "close" button because they don't have the patience to wait for the lift doors to shut. But lifts' "close" buttons are a complete scam (骗局), at least in the US-the doors will not close any faster no matter how hard you press.

    It started in the 1990s when the Americans with Disabilities Act was passed in the US, making sure that all lifts stayed open long enough so that people with disabilities could enter. Only US firefighters and repairmen can use the buttons to speed up the door-closing process if they have a code or special keys.

    But to normal lift riders, the buttons aren't completely useless. According to psychologists, fake buttons can actually make you feel better by offering you a sense of control.

    "Perceived (能够感知的) control is very important. It reduces stress and increases well-being," Ellen J. Langer, a psychology professor, said, "having a lack of control is associated with depression（沮丧）."

    Experts have revealed that a lot of buttons that don't do anything exist in our lives for this same purpose. For example, many offices in the US have fake thermostats (温度调节器) because people tend to feel better when they think they can control the temperature in their workplace.

    Pedestrian(行人) crosswalk buttons don't live up to their names either. Pressing them used to help make the traffic signals change faster, but that was before computer-controlled traffic signals were introduced.

    But psychologists found it interesting that even when people are aware of these little "white lies", they still continue to push fake buttons because as long as the doors eventually close, it is considered to be worth the effort.

    "That habit is here to stay," John Kounios, a psychology professor, said. "Even though I have real doubts about the traffic light buttons, I always press them. After all, I've got nothing else to do while waiting. So why not press the button in the hope that this one will work?"

    When French students go to school, they have to leave one of their most prized possessions at home — their smartphones. French lawmakers passed a law on July 31, 2018, banning students 15 and under from bringing smartphones and tablets to school, or at least requiring they be turned off at school. Officials in support of the new rule described the policy as a way to protect children from addictive habits and to safeguard the sanctity of the classroom.

    "We know there is a phenomenon of screen addiction," education minister Jean-Michel Blanquer said. "Our main role is to protect students. It is a fundamental role of education, and this law allows it."

    The law, however, makes exceptions for educational use, after-school activities and for students with disabilities. French high schools can choose to force a less-strict ban on Internet- connected devices.

    Even before the new policy was voted in, French law carried out in 2010 prohibited students from using their phones while class was in session. But during the 2017 French presidential election, Emmanuel Macron promised to force a school ban on phones entirely.

    This isn't the first French law designed to beat back the influences of digital technology in everyday life. In 2017 the government passed a law requiring French companies to draft rules that limited work emails and work-related technology outside the office. Referred to as the "right to disconnect," French officials said the law aimed to reduce job-related stress and prevent employee burnout.

    "Employees physically leave the office, but they do not leave their work. They remain attached by a kind of electronic tie," said Benoît Hamon, former French education minister. "The texts, the messages, the emails: they control the life of the individual to the point where he or she eventually breaks down."

    Scientists Diego Kersting and Cristina Linares have found that some coral species are able to recover from harmful warming events through a unique survival strategy (策略)—known as "rejuvenescence" (新生)—among corals in the Mediterranean Sea. The findings represent some rare good news for corals around the world, which are facing numerous severe threats—most notably, climate change.

    "The main threats are climate change, overfishing, pollution and coastal urbanization," Kersting said. "But currently, climate change is probably the one causing the most coral cover declines. Warming stresses corals up to a point that may cause death. Some corals bleach (白化) before dying. Other corals do not bleach but die directly." He went on, "Our findings are significant because this survival strategy was only known from fossil corals that existed hundreds of millions of years ago. It is the first time that it has been found in a living coral. Thanks to our findings, we know now that some corals are able to recover, but unfortunately this is not enough in the current climate change context."

    For their research, Kersting and Linares monitored 243 colonies of the endangered reef-building coral Cladocoracaespitosa in Spain's Columbretes Islands Marine Reserve over 16 years, starting in 2002. The monitoring revealed that Cladocoracaespitosa in the Mediterranean uses rejuvenescence to cope with warming events. This process involves the polyps — or the individual coral animals in a colony—shrinking inward and abandoning their skeletons (骨骼) during warm periods, before rejuvenating at a later point. "What happens is that some polyps in a coral colony—sometimes just one— reduces completely its dimensions and partially retreats from its skeleton," Kersting said. "Once the stressful event is over, the shrunken or rejuvenated polyp recovers its size and builds up a new skeleton. Eventually, it begins to reproduce itself through budding and begins to cover the dead colony surfaces."

    He continued, "The results were very surprising because I started to observe colonies that were dead years ago, that were showing living parts many years after their death."