“Let's have a journey. Why not fly out and meet me, Dad?” I say one day.

    My father had just retired after 27 years as a manager for IBM. His job filled his day, his thoughts, and his life. While he woke up and took a warm shower, I screamed under a freezing waterfall in Peru. While he tied a tie and put on the same Swiss watch, I rowed a boat across Lake of the Ozarks.

    My father sees me drifting aimlessly, nothing to show for my 33 years but a passport full of funny stamps. He wants me to settle down, but now I want him to find an adventure.

    He agrees to travel with me through the national parks. We meet four weeks later in Rapid City.

    “What's our first stop？” asks my father.

    “What time is it？”

    “Still don't have a watch？”

    Less than an hour away is Mount Rushmore. As he stares up at the four Presidents carved in granite(花岗岩), his mouth and eyes open slowly, like those of a little boy.

    “Unbelievable,” he says. “How was this done？”

    A film in the information center shows sculptor Gutzon Borglum devoted 14 years to the sculpture and then left the final touches to his son.

    We stare up and I ask myself, “Would I ever devote my life to anything？”

    No directions, no goals. I always used to hear those words in my father's voice. Now I hear them in my own.

    The next day we're at Yellowstone National Park, where we have a picnic.

    “Did you ever travel with your dad？” I ask.

    “Only once,” he says. “I never spoke much with my father. We loved each other — but never said it. Whatever he could give me, he gave.”

    That last sentence — it's probably the same thing I'd say about my father. And what I'd want my child to say about me.

    In Glacier National Park, my father says, “I've never seen water so blue.” I have, in several places of the world. I can keep traveling, I realize — and maybe a regular job won't be as dull as I feared.

    Weeks after our trip, I call my father.

    “The photos from the trip are wonderful,” he says. “We've got to take another trip like that sometime.”

I tell him I've decided to settle down, and I'm wearing a watch.

    Dust on furniture may be bad news for waistlines (腰围). But it's far too early to add dusting to a weight-loss plan. Dietary fats and other materials that make up indoor dust can send a signal to human fat cells, telling them to grow. That process, in turn, might slow the body's rate of burning energy. Such changes could add to any weight problems a person might have.

    “We don't know what that means to long-term health and certain diseases yet,” says Heather Stapleton, one of the study's authors. But she notes that her team's findings also raise a question of whether pollutants in dust might play some role in the growing, global problem of obesity (肥胖).

    Stapleton and her colleagues collected dust from homes and offices. Studies found that some materials in the dust could turn on a protein (蛋白质) called PPAR-gamma 1. It's found in many human tissues. Turning this protein on can cause fat cells to grow. Researchers think this protein may be involved in obesity. But a second study now finds evidence that certain fats are mostly to blame. Cooking oils may send out some of these fats into the air, where they eventually find their way into house dust. Or, the authors say, the fats might enter house dust as part of the hair or skin cells shed (脱落) by people or pets.

    “While the findings are amazing,” says Mitchell Lazar, another study author, “these findings need to be taken as very limited.” Indeed, he adds several cautions about how the findings should be understood. “For one thing, people eat these fats in foods all of the time. That is likely to be a lot more than would be consumed from indoor dust,” he said.

    Teenagers around the world can be happy with the news that the brain will ignore parents' order when they tap on their smartphones. A new scientific study from the University College London has shown that humans may temporarily go deaf when they're focusing on something visual at the same time.

    The researchers played the normal-volume sounds in the background. And 13 volunteers experienced inattentional deafness as their visual tasks became increasingly difficult. “We found that when volunteers were performing the demanding visual task, they were unable to hear sounds that they would normally hear,” Maria Chait said in a statement. “The brain scans showed that people didn't filter out the sounds on purpose. They were not actually hearing them in the first place.”

    The findings, published in the Journal of Neuroscience, suggest that the centre of sights and the center of sounds share limited resources. Inattentional deafness is a common everyday experience and the study explains why, according to UCL Institute of Cognitive Neuroscience Professor Nili Lavie.

    If you try to talk to someone focusing on a book, game, or television program and don't receive a response, they aren't necessarily ignoring you. They simply might not hear you at all. This could also explain why you might not hear your bus or train stop being announced if you're absorbed in your phone, book or newspaper. However, some loud sounds will still be able to break through.

    Some situations could become potentially dangerous when the quieter ones go unheard. As you can imagine, in the operating room, when a doctor concentrates on his work, he might not hear the equipment beeping. It also applies to drivers who concentrate on complex directions. Fortunately, experts have given us some useful tips on preventing such situations.

    Actors Keira Knightley and Kristen Bell have both commented on their worries about using Disney princesses as role models for their children.

    On a famous talk show, Knightley said her daughter (who was born in 2015) was "banned" from watching Cinderella, which Disney produced as a cartoon in 1950 and a live-action film in 2015. "Cinderella waits around for a rich guy to rescue her. Don't. Rescue yourself! Obviously."

    Knightley added that she had also forbidden The Little Mermaid, the 1989 cartoon. "This is the one that I'm quite annoyed about because I really like the film. I mean, the songs are great, but do not give up your voice for a man. Well, that's a little difficult to handle, but I'm keeping to it."

    Bell, the star of Frozen, expressed her disapproval of the Snow White fairytale, which became a classic Disney cartoon in 1938. In an interview with parents, Bell said: "I look at my girls and ask, ‘Don't you think it's very unusual that Snow White didn't ask the old witch why she needed to eat the apple? Or where she got that apple?' I say, 'I would never take food from a stranger, would you?' And my kids respond, 'No!' And I think I'm doing something right."

    Bell, who played a Disney princess in Frozen, said she also used the story to illustrate issues about permission. She says that she asked her children: "Don't you think that it's very strange that the prince kisses Snow White without her permission? … Because you cannot kiss someone if they're sleeping!"

    Bell later responded to criticism on social media. To one user she wrote: "Everything is a message to our children, because they are sponges(海绵) that soak up everything and are learning how to be adults through what they see. I want my girls to see and practice critical thinking and respectful behavior."

    Science is finaly beginning to embrace animals who were, for a long time, considered second-class citizens.

    As Annie Potts of Canterbury University has noted, chickens distinguish among one hundred chicken faces and recognize familiar individuals even after months of separation. When given problems to solve, they reason: hens trained to pick colored buttons sometimes choose to give up an immediate food reward for a slightly later (and better) one. Healthy hens may aid friends, and mourn when those friend die.

    Pigs respond meaningful to human symbols. When a research team led by Candace Croney at Penn State University carried wooden blocks marked with X and O symbols around pigs, only the O carriers offered food to the animals. The pigs soon ignored the X carriers in favor of the O's. Then the team switched from real-life objects to T-shirts printed with X or O symbols. Still, the pigs walked only toward the O-shirted people: they had transferred their knowledge to a two-dimensional format, a not inconsiderable feat of reasoning.

    I've been guilty of prejudiced expectations, myself. At the start of my career almost four decades ago, I was firmly convinced that monkeys and apes out-think and out-feel other animals. They're other primates(灵长目动物), after all, animals from our own mammalian(哺乳动物的) class. Fairly soon, I came to see that along with our closest living relatives, whales too are masters of cultural learning, and elephants express profound joy and mourning with their social companions. Long-term studies in the wild on these mammals helped to fuel a viewpoint shift in our society: the public no longer so easily accepts monkeys made to undergo painful procedure kin laboratories, elephants forced to perform in circuses, and dolphins kept in small tanks at theme parks.

    Over time, though, as I began to broaden out even further and explore the inner lives of fish, chickens, pigs, goats, and cows, I started to wonder: Will the new science of "food animals" bring an ethical (伦理的) revolution in terms of who we eat? In other words, will our ethics start to catch up with the development of our science?

    Animal activists are already there, of course, committed to not eating these animals. But what about the rest of us? Can paying attention to the thinking and feeling of these animals lead us to make changes in who we eat?

A clever technologist took steamboat inventions and turned them into the first commercial steamboat service.

Although Robert Fulton did not invent the steamboat, as is commonly believed, he played an important role in making steamboat travel a reality. He was born in Pennsylvania in 1765. As a young man, he set out to make his name as a portrait painter. His career took him to Europe and into the orbit of people with the power to support him politically and financially.

Fulton entered London society after he painted Benjamin Franklin's portrait. While abroad, Fulton left the arts for a career in shipbuilding. He was interested in the recently-invented steam engine, and thought it could be used to power ships. Fulton's vision was not original; many others had entered the field, and the unfortunate inventor John Fitch had built a working steamship already. But like Henry Ford, Fulton's talent lay not in the invention but in the product's application in the marketplace.

Fulton didn't focus entirely on the steamboat. In 1804, he tested the first submarine successfully, which he had built for the British Royal Navy. His invention would make him a celebrity upon his return to the United States two years later. Fulton's partner Robert Livingston obtained an exclusive license for steamboat services on New York's Hudson River. It was time for Fulton to deliver.

To build an efficient, reliable steamboat, Fulton used a special English steam engine. The ship's bottom was flat and its stern was square. The steamboat Clermont made its debut (首次亮相) on August 17, 1807, steaming up the river from New York to Albany, and it soon entered commercial services. The hilly terrain of New York made water transport faster than land transport, and Fulton's boat — formerly known as the "North River Steamboat" — was a hit. Within five years, Fulton would be running services on six major rivers plus the Chesapeake Bay, and bring in great profits.