In colonies (群体) that range in size from a few hundred to tens of millions, they organize their lives with a clear division of labor. Even more amazing is how they achievethis level of organization. Where we use sound and sight to communicate, ants dependprimarily on pheromone (外激素), chemicals sent out by individuals and smelled or tastedby fellow members of their colony. When an ant finds food, it produces a pheromone that will lead others straight to where the food is. When an individual ant comes under attack or is dying, it sends out an alarm pheromone to warn the colony to prepare for a conflict as a defense unit.

         In fact, when it comes to the art of war, ants have no equal. They are completely fearless and will readily take on a creature much larger than themselves, attacking in large groups and overcoming their target. Such is their devotion to the common good of the colony that not only soldier ants but also worker ants will sacrifice their lives to help defeat an enemy.

         Behaving in this selfless and devoted manner, these little creatures have survived on Earth, for more than 140 million years, far longer than dinosaurs. Because they think as one, they have a collective (集体的) intelligence greater than you would expect from itsindividual parts.

    It has been several weeks since we tookour daughter to college and she seems to be adjusting  well after a short period of homesickness.For us, though, it's another story. Like most parents, I love checking in on mychildren at night. But now she's gone, and I find nighttimes the hardest. Imiss her most at night.

    In my neighborhood, most of the parentswhose kids are off to college are dealing with similar melancholy. Myhusband is filled with anxiety. One friend talked about getting this sickfeeling in her stomach as she prepared for the college drop-off. We complainedthat many of us were too busy to truly enjoy being with our children while wehad them.

    For us moms, seeing Toy Story 3 onlymade the sadness worse as we watched the character Andy, who is the same age asour kids, say goodbye to his childhood as he prepares to leave for college. Andit's not just “first-time” parents like me. Two moms who have kids already wellinto college said the separation didn't get any easier. “You feel likesomething has been taken away from inside you,” said one of them.

    I imagine things will get easier withtime, especially as I see my daughter adjust to college life. Meanwhile, as Ikeep my cell phone close to me in bed and text my daughter goodnight and sweetdreams every night, I like to think at messages serve as a night light thatkeeps her safe.

    As the weather costs you a loss on trains and flights, we look at your rights.

• Cancelled trains

    On a single ticket, a passenger will usually receive 25% of the fare if the train is delayed by 15 minutes. If the delay reaches 30 minutes, the compensation(补偿/补偿金) rises to 50%, and if it's over an hour you should be able to reclaim the whole cost. Clear arrangements vary according to train operator (运营商).

    If you were due to travel, to say Aberdeen from London, your train is cancelled and you decide not to travel, you can get a full compensation. If you had a non-cancelable ticket with one operator, and failed to make that train because the connecting train was delayed, you can take the next available train.

• Flights

    If your flight is cancelled because of the snow you have the right to a full compensation of the ticket, or to be rerouted home on a later flight.

    But you will have no right to get a delay or cancellation compensation under EU rules, because the snow is an extraordinary circumstance beyond the airline's control. If you don't take the compensation and choose to be rerouted, and It means you are stuck at the airport overnight, it's the airline's duty to pay for a reasonably priced hotel room and meals.

    The airline has to reroute you at the earliest opportunity, or at the passenger's free time, you are supposed to take the availability of seats.

    If you choose to be rerouted or if your departure is delayed by more than two hours, airlines also have to provide assistance such as food. The airlines keep this quiet and getting the money out of the low-cost operators can be a hard job. Keep evidence of cancellations, all receipts, and use your mobile to video any offer to pay by airline staff.

    Reading makes you a smarter, better leader. But if you've been following the latest science, you'll also know that studies have shown regularly picking up a book might increase your empathy (共鸣) and protect you from feeling lonely, hopeless or suffering from dementia (痴呆) in later life. But obviously, that's not the end of the list. New research has discovered yet another benefit of being a reader who focuses one's mind on reading.

    After following those surveyed based on more than 3,500 adults over age 50 for 12 years, the team from Yale University behind the research found that those who read books for 3.5 hours a week were 23 percent less likely to die. Reading for less than 3.5 hours a week lowered participants' (参加者) risk of death by 17 percent. Put another way, picking up an interesting book could earn you about an extra two years.

    It's worth noticing that the researchers were looking exactly at time spent in reading books, rather than newspapers, magazines, or online media, and that this difference is important for the observed advantages of reading. “We found that reading books provided a greater advantage than reading newspapers or magazines,” said Avni Bavishi of the Yale School of Public Health. “This effect is likely because books attract the readers' mind more — providing more cognitive (认知的) advantages, and therefore increasing the lifespan (寿命). In short, deep slow reading rather than reading quickly and carelessly is best.”

    So how long should you be reading for, and what sort of titles should you pick up? While more reading seems to be better, the researchers suggest that anything more than

    30 minutes a day will be likely to do good to you. As for what exactly to read, the researchers can't yet offer much advice beyond making time for actual books, though they pointed out this was a promising way to future research.

Hot Spots for Retirees to Start Their Encore Career

    Encore Career: Vocational School Instructor

    Retire in: Los Angeles, CA

    Ever since IBM CEO Ginni Rometty coined the term "new collar" to describe well-paid jobs that require specific skills but not necessarily a degree, vocational schools have made a serious comeback. Apparently instructors are in short supply in sunny L.A., where there are 13 jobs at vocational schools for every applicant on the market. This is a great opportunity for skilled retirees since, unlike teaching at a public school that requires a state certificate, the only requirement here is that you be a seasoned expert in your field.

    Encore Career: Business Consultant

    Retire in: Miami, FL

    Consulting is a great option for a retired business professional looking to make their own hours, be their own boss, and earn as much or as little as needed to maintain their standard of living. For every consultant in Miami right now there are 13 businesses hoping to hire them. There's even greater demand here than in Washington D.C., which is typically considered the consulting capital of the world.

    Encore Career: Tourist Wrangler

    Retire in: Austin, TX

    As the economy continues to boom and more Americans have extra income to spend, the tourism industry has taken off. This is particularly true in Austin, TX, where there were astonishing 36 tourism jobs for every applicant in July. Between four-star hotels, the noisy rock n' roll scene, and a new food culture, Austin is the place to be if you want to work in service industry.

    Encore Career: Supporter of the Arts

    Retire in: Charleston, SC

    If you're a Baby Boomer with a degree in the arts, now could be the perfect time to revisit your passion for creativity, especially if you also want to live in the center of southern charm. Between the 14 art galleries on King Street in Old Town, an abundance of acting companies and theaters, and music festivals, it's not surprising there were 25 jobs for every arty applicant iii Charleston.

The huge billboard at the side of the highway is no joke; transporting firewood in certain areas is a crime, punishable by a four-thousand-dollar fine. The reason? Emerald Ash Borer disease, or EAB disease, a new addition to the long list of dangerous foreign pest infestations（虫害）on American soil. It was in 2002 when the Emerald Ash Borer beetle（甲虫）was first discovered in Michigan. Not long after, the pest was found in Ohio. Originally from Asia, this green beetle probably found its way to North America through a wooden box made of ash wood and immediately settled into a local ash tree. In little time, the species managed to kill millions of ash trees. 

To date, much work is underway to stop ash trees ending up in the same group as elm and chestnut trees, which are all dying out in many areas. Ash Borer Infestations are particularly troublesome because they are difficult to identify until the ash tree is heavily infested. In addition, other ash trees in the area surrounding the source will probably also be infested, making control a hard task. 

Researchers are working on many issues related to the control and removal of this harmful beetle. For example, it has been discovered that Asian ash trees are not destroyed by this native borer. It may be that, Asian ash trees have developed genes（基因）to protect them from the insect; therein, perhaps, lies the secret to controlling this pest. Insecticide（杀虫剂）treatment is also being explored on several fronts. Research is underway to determine which insecticides are proving to be the most successful. The proper application of the insecticides is being debated. 

However, all possible solutions require a great deal of study and research. In the meantime, careful steps must be taken. Methodical identification of infested trees is taking place. Identified trees are being cut down and destroyed to get rid of the beetle colonies（群）. In the end, this puts a huge drain（消耗）on city budgets, as tree removal can be extremely expensive. 

Even though it will be expensive to deal with this problem in the short term, the costs of doing nothing could be far higher, since we could lose an entire species of tree.