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.

         Before birth, babies can tell the difference between loud sounds and voices. They can even distinguish their mother's voice from that of a female stranger. But when it comes to embryonic learning(胎教), birds could rule the roost. As recently reported in The Auk: Ornithological Advances, some mother birds may teach their young to sing even before they hatch(孵化)。New-born chicks can then imitate their mom's call within a few days of entering the world.

    This educational method was first observed in 2012 by Sonia Kleindorfer, a biologist at Flinders University in South Australia, and her colleagues. Female Australian superb fairy wrens were found to repeat one sound over and over again while hatching their eggs, When the eggs were hatched, the baby birds made the similar chirp to their mothers—a sound that served as their regular “feed me!”call.

To find out if the special quality was more widespread in birds, the researchers sought the red-backed fairy wren, another species of Australian songbird. First they collected sound data from 67 nests in four sites in Queensland before and after hatching, Then they identified begging calls by analyzing the order and number of notes. A computer analysis blindly compared calls produced by mothers and chicks, ranking them by similarity.

    It turns out that baby red-backed fairy wrens also emerge chirping like their moms. And the more frequently mothers had called to their eggs, the more similar were the babies' begging calls. In addition, the team set up a separate experiment that suggested that the baby birds that most closely imitated their mom's voice were rewarded with the most food.

    This observation hints that effective embryonic learning could signal neurological(神经系统的) strengths of children to parents. An evolutionary inference can then be drawn.“As a parent, do you invest in quality children, or do you invest in children that are in need? ”Kleindorfer asks. “Our results suggest that they might be going for quality. ”

    I call my story the story of a bad boy, partly to distinguish myself from those faultless young gentlemen, and partly because I really was not an angle. I may truthfully say I was a friendly, impulsive(易冲动的)teenager. I didn't want to be an angel. In short, I was a real human boy, such as you may meet anywhere in New England.

Whenever a new scholar came to our school, I used to ask him " My name's Tom Bailey; what's your name?" If the name struck me favorably, I shook hands with the new pupil cordially, but if it didn't, I would turn and walk away, for I was particular on this point.

I was born in Rivermouth almost fifty years ago, but, before I became very well acquainted with that pretty New England town, my parents moved to New Orleans. I was only eighteen months old at the time of the move, and it didn't make much difference to me where I was, because several years later, when my father proposed to take me North to be educated, I had my own view on the subject. I instantly kicked over the little boy, Sam, who happened to be standing by me at the moment, and declared that I would not be taken away to live among a lot of Yankees! You see I was what is called " a Northern man with Southern principles," I had no recollection of New England: my earliest memories were connected with the South. I knew I was born in the North, but hoped nobody would find it out. I never told my schoolmates I was a Yankee, because they talked about Yankees in a scornful way which made me feel that it was quite a shame not to be born in the South.

And this impression was strengthened by Aunt Chloe, who said, "There wasn't no gentlemen in the North no way."

    With this picture of Northern civilization in my eye, the readers will easily understand my terror at the bare thought of being transported to Rivermouth to school, and possibly will forgive me for kicking over little Sam, when my father announced this to me. As for kicking little Sam, I always did that, more or less gently, when anything went wrong with me.

    My father was greatly troubled by this violent behavior. As little Sam picked himself up, my father took my hand in his and led me thoughtfully to the library. He appeared strangely puzzled on learning the nature of my objections to going North.

"Who on earth, Tom, has filled your brain with those silly stories?" asked my father calmly.

"Aunt Chloe, sir, she told me."

My father devoted that evening and several evenings to giving me a clear account of New England: its early struggles, its progress, and its present condition. I was no longer unwilling to go North; on the contrary, the proposed journey to a new world full of wonders kept me awake nights. Long before the moving day arrived I was eager to be off. My impatience was increased by the fact that my father had purchased for me a fine little Mustang pony, and shipped it to Rivermouth two weeks before the date set for our own journey. The pony completely resigned me to the situation. The pony's name was Gitana, which is the Spanish for "gypsy", so I always called her Gypsy.

    Finally the time came to leave the vine-covered mansion among the orange-trees, to say goodbye to little Sam(I am convince he was heartily glad to get rid of me), and to part with Aunt Chloe. I imagine them standing by the open garden gate; the tears are rolling down Aunt Chloe's cheeks; they and the old home fade away. I am never to see them again!

    Aging brings wrinkles, sagging bodies and frustrating forgetfulness. But getting older is not all bad for many people. Mounting evidence suggests aging may be a key to happiness. There is conflicting research on the subject, however, and experts say it may all boil down to this: Attitude is everything.

    Older adults tend to be more optimistic and have a more positive outlook on life than their younger and stressed opposites. The big question is why seniors are happier. A recent study suggests one reason: Older adults remember the past through happy memories. Aging can bring more cheer as people become more comfortable with themselves and their roles in society. The older adults said they were enjoying more time with their family, spending more time on hobbies and having greater financial security and did not have to work.

    But others are doubtful about the link between happiness and growing older.

    "The notion that those in old age are happiest is misleading," said Richard Easterlin, a professor of economics at the University of Southern California. "It is based on comparing people of different ages who are the same in terms of income, health, family life." Easterlin added, "When you take account of the fact that older people have lower income than younger, are less healthy, and more likely to be living alone, then you will find it hard to accept that they are happier.

    In fact, scientists have found that as people age, their health declines and social networks disappear as their friends die, which can make the elderly less happy.

    Even if one does give in to age's dark side, health and happiness don't always go hand-in-hand. It's all about attitude. Research by the University of Chicago's Yang suggests that attitude about life and happiness, is partly shaped by the era in which a person was born. It turns out that individuals who adapt the best to changes also have the highest expected levels of happiness.

 Despite the conflicting findings about aging and happiness, the good news is that there doesn't appear to be a limit to how much happiness one can achieve in one's life. “Most people desire happiness,” Easterlin said. “To my knowledge, no one has identified a limit to attainable happiness.”

    How do I book a place on Airbnb?

    When you book a place on Airbnb, you are making arrangements to stay in Someone's home. Each host has their own style of hospitality, starting with how. They like to get to know their guests. Some hosts want to approve reservations, while others are comfortable letting you book their place instantly without waiting for approval.

    ⒈Complete Your Personal Details

    In either case, it's important to know that Airbnb is a community that relies on trust. Complete your personal details before you request a reservation with a host, so they can know a little bit about you when they confirm. Your personal details should include photos and verifications (证明）, especially because some hosts require guests to have a profile photo and verified ID in order to book.

    ⒉Find the Right Place

    With over 800,000 unique listings around the world, you'll want to make sure the place you choose has everything you need for a comfortable and memorable trip. When searching for a place, make sure to include your dates and number of guests to get the most accurate pricing. Read reviews, descriptions, house rules, and facilities for each place to see if it's the right fit for your trip. You can always contact the host if you have any questions about their home.

    ⒊Book It!

    You've found the perfect place, and now it's time to make it official. This is where the host's preferred way of booking will determine how you'll confirm your reservation.

    Instant Book

    For hosts who don't want to approve each reservation, you'll see a button on their listing that says Instant Book. Like the name suggests, you can confirm a reservation at these places right away.

    Request to Book

    Many hosts prefer to approve reservations before they're final. In this case, you'll see a button on their listing that says Request to Book. To submit a reservation request, you'll need to enter your payment details.

    Hosts have 24 hours to accept your request, and your reservation is automatically confirmed once they do.

    Pre-approvals and Special Offers

    If you decide to contact the host to ask questions before attempting to book, the host may respond to your message by inviting you to make a reservation with either a Pre-approval or a Special Offer. A Pre-approval is an invitation to finish booking for the dates and number of guests you noted in your message. A Special Offer gives the host the opportunity to provide special pricing, dates, and other reservation details before you book.

Everyone has a phone in their pocket nowadays, but how often do we really use them for their original purpose-to make a call? Telephone culture is disappearing. What brought us to this moment, and what are its effects?

"No one picks up the phone anymore," wrote Alex C. Madrigal on The Atlantic. The reflex of answering-centu20^th—telephonic culture—is gone."

The shift is of course due in large part to more communication options: Texting with photos, videos, emojis, reaction gifs, links and even voice messages can be a more attractive option.

Texting is light and fun, not nearly as demanding of your attention as a phone call. It can also be done with multiple people at the same time. Social media, email and video calls have also eaten away at traditional phone calls.

In recent years, another reason has caused people to ignore phone calls completely: robocalls. Robocalls are automate messages from organizations verifying your phone number or telemarketers trying to sell something. Americans received 22.8 billion robocalls halfway through 2020, equaling an annual rate of 45.6 billion, slightly below 2018 numbers, according to YouMail, a robocall protection service and blocking app.

As telephone culture disappears, what is the loss of a singular family phone doing to the family unit? Early landline phones unified family members, whereas mobile phones isolate them.

"The shared family phone served as an anchor for home," said Luke Fernandez, a Weber State University computer-science professor and co-author of Bored, Lonely, Angry, Stupid: Feelings About Technology, From the Telegraph to Twitter. "With smartphones we have gained mobility and privacy. But the value of the home has been diminished, as has its ability to guide and monitor family behavior and perhaps connect families more closely," Fernandez said.

Of course, as technology progresses, lives always change for better or for worse. With the loss of telephone culture, families will need to find other ways to unite.