Cleverness is a gift while kindness is a choice．Gifts are easy—they're given after all．Choice can be hard．

    I got the idea to start Amazon 16 years ago．I came across the fact that the Internet usage was growing at 2300 percent per year．I'd never seen or heard of anything that grew that fast，and the idea of building all online bookstore with millions of titles was very exciting to me. I had just turned 30 years old，and I'd been married for a year．I told my wife MacKenzie that I wanted to quit my job and go to do this crazy thing that probably wouldn't work since most start-ups don't and I wasn't sure what to expect．MacKenzie told me I should go for it．As a young boy，I'd been a garage inventor．I'd always wanted to be all inventor，and she wanted me to follow my passion．

    I was working at a financial firm in New York City with a bunch of very smart people and I had a brilliant boss that I much admired．I went to my boss and told him I wanted to start a company selling books on the Internet．He took me on a long walk in Central Park，listened carefully to me，and finally said，“That sounds like a really good idea，but it would be an even better idea for someone who didn't already have a good job．”That 1ogic made some sense to me，and he convinced me to think about it for 48 hours before making a final decision．Seen in that light,it really was a difficult choice，but finally，I decided I had to give it a shot．I didn't think I'd regret trying and failing．And I suspected I would always be haunted by a decision to not try at all.

    After much consideration ，I took the less safe path to follow my passion ，and I'm proud of that choice．For all of us，in the end，we are our choice．

    “We are good mothers,” I said to my friend, as we sat on our comfortable beach chairs under our beach umbrella and watched our children playing in the waves.

    Out of nowhere, the children took off running. About fifty yards from us, a man—maybe in his fifties—was fishing. The children stood next to him and watched with their little mouths hanging open as he cast the fishing lines. He smiled at them. They ran back to us—all except my three-year-old daughter, Drew.

    My heart beat fast with horror. “Drew! Come here! Play with your friends!” I shouted, very aware that my speeches about not talking to strangers weren't working. It seemed that many parents heard of horrible stories about children being taken away by strangers. Responsible mothers should teach their children that the world is a dangerous place. So I felt relieved (松口气) when Drew ran towards me and took hold of a shovel (铲子). Then she looked me in the eye: “I want to be with the person.”

    Again, she approached the middle-aged man, and started digging next to him.

    Several seconds later, she returned, waving something shiny.

    “Look, Mommy! A toy fish!”

    It was, indeed, a toy fish—yellow and rubber. This must have been what he was using to attract the fish. And he'd given it to Drew. The three other children were deeply impressed, and they didn't try to hide how jealous(妒忌的)they were—clearly, they all wanted the fish.

    “My friend gave me that fish!” Drew shouted loudly. The sand in front of the umbrella turned into a preschool cage match with a yellow rubber fish flying through the air. I felt like I might cry myself.

    Unexpectedly, there he was: the man, standing right next to us with three more rubber fish in hand. He handed them to each of the children. By their faces, you would have thought he was actually the really kind big brother.

    “Thank you,” I said, realizing that there is good and kindness in strangers.

    Are you content with the shape of your nose? If not, the climate may be to blame, not your parents.

This is according to a recent study carried out by scientists from Pennsylvania State University, US. They found that climate played a key role in shaping our noses. The findings were based on an examination of the size and shape of noses of 476 people from four regions—West Africa, East Asia, South Asia and Northern Europe, using 3-D facial imaging technology.

     “People have thought for a long time the difference in nose shape among humans across the world may have arisen as a result of natural selection because of climate,” Arslan Zaidi, one of the lead authors of the study, told The Guardian. But while previous studies were based on measurements from human skulls, Zaidi and his team looked at nose shape itself.

    The result showed that wider noses are more common in warm and humid climates, while narrower noses are more common in cold and dry climates. That, Zaidi said, could be because narrower nasal passages help to increase the moisture (潮湿) content of air and warm it，which is easier on our lungs. This, in turn, led to a gradual decrease in nose width in populations living far away from the equator.

    More study is still needed to test the link between climate and nose shape, but Zaidi believes the current findings are valuable in understanding potential health issue. “As we become more of a global community, we are going to come across climates that we are not adapt to,” he told the Guardian. This means moving to a very different climate might increase the risk of breathing problems.

    However, he added, “This may not be necessarily true for various reasons such as of modern medicine and the fact that our current climate is very different from what it used to be.”

    After I mastered my first concerto (协奏曲) at the age of 14, my parents decided to get me a nice violin. I tried out dozens of instruments before I found my match: a German violin. It was beautiful, but what I liked best about it was its voice. Confident and strong, it was everything I longed to be.

    I'm not sure how much that violin cost, but my parents made me promise never to let it out of my sight. They didn't understand that pulling a large violin case ran counter to my daily middle school task of not being noticed. I was a strange, absent-minded kid. When I spoke up in class, my comments brought confused silence from teachers and wild laughter from students. Like a deer in a wolf pack, I tried to be quiet and still.

    However, my new violin was almost shockingly loud. Together, we were much louder than the rest of my middle school orchestra—which was encouraged, since the other kids made sounds like cats' crying. For one wonderful hour every day, I was showered with attention. Everyone wanted to hear what I had to say.

    Between classes, I bent under the combined weight of my violin case and a backpack filled with books. My body suffered, but my confidence grew. With my violin by my side, I found my voice. More and more, I contributed to class discussions and even made a couple of friends.

    Today, I'm just an excellent violinist with a regular day job. As I sit in my community orchestra, sometimes I feel jealous (嫉妒的) of my fellow musicians' instruments with their elegant voices. I may not be the best violinist around, but at least I'm still the loudest.

    By analyzing the fossilized teeth of some of our most ancient ancestors, a team of scientists led by the universities of Bristol (UK) and Lyon (France) have discovered that the first humans significantly breastfed their infants (婴儿) for longer periods than their contemporary relatives.

    The results, published in the journal Science Advances, provide a first insight into the practice of weaning (断奶)that remain otherwise unseen in the fossil record.

    The team sampled minute amounts from nearly 40 fossilized teeth of our South African fossil relatives, early Homo, Paranthropus robustus and Australopithecus africanus. They measured the proportions of their stable calcium isotopes (同位素）in the tooth enamel(牙釉质), which are a function of the mother milk intake by infants. They show that early Homo offspring(后代) was breastfed in significant proportions until the age of around three to four years, which likely played a role in the apparition of traits that are specific to human lineage(血统), such as the brain development.

    In contrast, infants of Paranthropus robustus, that became extinct around one million years ago and were a more robust species in terms of dental anatomy, as well as infants of Australopithecus africanus, stopped drinking sizeable proportions of mother milk in the course of the first months of life.

    These differences in nursing behaviors likely come with major changes in the social structures of groups as well as the time between the birth of one child and the birth of the next.

    One of the study's lead authors, Dr Theo Tacail said: "The practice of weaning -- the duration of breastfeeding, age at non-milk food introduction and the age at cessation of suckling -- differs among the modern members of the hominid family which includes humans and modern great apes: orangutan, gorillas, chimpanzees and bonobos.

    The development of such behavioral differences likely played major roles in the evolution of the members of human lineage, being associated for instance with size and structure of social groups, brain development.

    However, getting insights into these behavioral changes from fossils that are millions of years old is a challenge and, so far, little evidence allow discussing nursing practices in these fossil species.

    The findings stress the need for further exploration of calcium stables isotopes compositions in the fossil record in order to understand the co-evolution of weaning practices with other traits such as brain size or social behaviors."

http://www.dentaldailynews.com/first-human-ancestors-breastfed-for-longer-than-contemporary-relatives/

https://www.sciencedaily.com/releases/2019/08/190829115427.htm

It is amazing how many of the things in science fiction and movies have become reality.For instance,in the movie Star Trek,the workers could go to a replicator(复制器) and order food,drinks or anything they could program into the computer.Before long,the item would appear.This is possible today,in a way,with technology we have had for years.

Several manufacturers(制造商) have created 3D printers.One company,MakerBot,has created a printer that the average person can afford.It is called The Replicator.You can download a lot of design software from the Internet for use with The Replicator.In the near future,rather than going to a store to buy what you need,you may be able to download what you want from the Internet and print it out at home.

The process was first used with music.At the very beginning,music was recorded onto plastic disks with etching(蚀刻法).Music can now be copied without a physical product.____ Rather than having to buy a physical book or magazine,you can now download them from the Internet in digital form.

This technology is already used in engineering and architecture.Melissa Shoes,a Brazilian foot wear company,is using this technology to create shoes.Rather than having to go through the current process of product design and development,the company is able to design and print shoes for display to see how well they will sell before having lots of them made.