November 11 is Veterans Day in the United States. A "veteran" is anyone who has served in the armed forces. The term "veteran" is not just for those who have served in wars. It describes anyone who has ever been in the army.

    On November11, people hold ceremonies(仪式) and parades(游行) to mark Veterans Day. Public officials take part in the events. Army bands play. And soldiers fire guns into the air to remember those who died in service to their country.

    The history of Veterans Day relates to World War I. Many people at the time called it "the war to end all wars." The United States entered the fighting in Europe in 1917. Over 13 million men and women were reported for duty in the army. World War I ended at 11 o'clock in the morning on November 11, 1918. The following year, President Woodrow Wilson signed an official statement to celebrate November 11th as Armistice Day in the United States. It would be a day to honor the men and women who had served in the U.S. armed forces during the war. In 1926, Congress made Armistice Day a national holiday.

    But new problems were on the way. Soon, everyone knew that World War I would not be the war to end all wars. In all, more than 4,000,000 Americans served in the armed forces during the first World War. And 16 million would serve during the second one.

    Armistice Day in 1945 was a special day in the United States. Germany had surrendered in May 1945 and Japan in August. Most men and women who had served in the war were home. So, instead of honoring just veterans of World War I, Americans also honored veterans of World War II. In 1954, Congress decided to change the name of Armistice Day. The holiday became Veterans Day.

    In the story of “The crow and the Pitcher” from Aesop's Fables, a thirsty crow(乌鸦) drops stones into a narrow jar to raise the low level of water inside so he can take a drink.

    Now scientists have evidence to back up that story. New Caledonian crows actually do understand how to make water displacement work to their advantage, experiments showed. The results suggest that the birds are, at least in some aspects, as smart as first-graders, according to the study.

    Researchers, led by Sarah Jelbert at the university of Auckland in New Zealand, presented six crows with tubes filled with water. Inside the tubes, a worm or piece of meat on a piece of wood was floating, just out of reach of the crow. In front of the tubes, the researchers arranged a bunch of heavy rubber erasers that would sink, and light plastic objects that would float. The crows found out that they could drop the heavy objects into the tubes in order to raise the water level and get their snack.

    However, the birds handled awkwardly in experiments in which they could choose to drop objects in either a wide tube or a narrow tube to get a snack, the researchers said. Dropping objects into narrow tube would lift the water level by a greater amount and put the treat within reach after just two drops. In contrast, it took around seven drops to raise the snack to the same level in the wide tube. The crows obviously didn't realize this, and most of them went for the wide tube first.

    Previous studies showed that chimps and human children can solve similar tasks. In a 2011 study, chimps and kids found out that they could put water into a tube to reach a peanut that was floating in small amount of water at the bottom.

    Starting Cycling

    We have two services designed to give people the confidence and knowledge to cycle successfully.

    Lessons

    All our instructors have been trained to National Standards level of “Bike-ability”. This means you will be trained to a standard consistent across the whole country.

    There are 3 levels of skills to progress through. Children would start with levels 1 & 2, progressing from the playground or park to cycle on less busy local roads. Teenager and adult beginners can also learn levels 1 & 2 in an off-road and quiet environment.

    Confident teenagers and adults can broaden their skills by learning level 3, using multi-lane roads and larger roundabouts. We provide both a complete package of lessons for the beginner or individual lessons tailored to the client. Whatever the need we can address and practice until perfect!

    Cost is ￡30 per hour.

    Guided Ride

    We know that riding on the roads in London can be scary, and if you have to navigate (确定行车路线) as well it can become a real hard task! The Guided Ride service takes all the stress out of it for you by providing the following:

    Route planned in advance to suit your skill level. Route map provided to you.

    Cycle and equipment checked. We will teach you a simple method to check basic roadworthiness (车辆性能) of your bike that you can perform on a weekly basis.

    Route discussed and focus given to any areas requiring special attention.

Cycle along with the instructor close behind. Here the traffic can be controlled by the instructor and rider observed.

    We currently cover London Zones 1 & 2. Please contact us if your requirements are outside of these areas.

    Cost ￡30 per hour.

    People have used pigeons to carry messages to one another for hundreds of years. In fact, pigeons were a common way to send messages right up through Would War II.

    In 1815, English troops were fighting Napoleon's forces in France, and the English were believed to be losing. A financial panic swept over London. Government bonds（债券）were offered at low prices. Few people noticed that Nathan Rothschild, an English banker, was snapping up these bonds when everyone else was trying to sell them. A few days later, London learned the truth: the Duke of Wellington had defeated Napoleon at the battle of Waterloo. The value of the bonds soared（暴涨）, and Rothschild became wealthy…all because his pigeons had brought him news of the victory before anyone else knew of it.

    Carrier pigeons were used by countries in both World War I and World War II. Not only were the birds often the fastest, most reliable way to send messages, they could also be used to reach soldiers far behind enemy lines, where radios and field telephone lines were useless. Since they could easily be released from airplanes or ships, every branch of the armed services used the birds.

    Carrying messages could be a dangerous job. Some pigeons performed with such bravery that they became famous and were even awarded medals. The most famous pigeon of all may have been Cher Ami. Stationed in France during World War I, he carried twelve important messages for American forces. On his last mission, though wounded, he carried a message that saved the lives of 194 American soldiers. For his amazing service, he was awarded the French “Croix de Guerre.”

    Today, modern communication methods can carry information from one place to another hundreds of times faster than a pigeon could do it. However, few people would argue with the fact that carrier pigeons — especially those that served in the military — have earned their place in history.

    Even before my father left us, my mother had to go back to work to support our family. Once I came out of the kitchen, complaining, "Mum, I can't peel (去皮)potatoes. I have only one hand. "

    Mum never looked up from sewing. "You get yourself into that kitchen and peel those potatoes," she told me. "And don't ever use that as an excuse for anything again!"

    In the second grade, our teacher lined up my class on the playground and had each of us race across the monkey bars, swinging from one high steel rod to the next. When it was my turn, I shook my head. Some kids behind me laughed, and I went home crying.

    That night I told Mum about it. She hugged me, and I saw her determined look. The next afternoon, she took me back to school. At the deserted playground, Mum looked carefully at the bars.

    "Now, pull up with your right arm," she advised. She stood by as I struggled to lift myself with my right hand until I could get the bar with my other elbow (月寸）.Day after day we practiced, and she praised me for every rung (梯级）I reached.

    I'll never forget the next time, crossing the rungs； I looked down at the kids who were standing with their mouths open.

    One night, after a dance at my new junior high, I lay in bed crying. I could hear Mum came into my room. "Mum," I said, weeping, "None of the boys would dance with me."

    For a long time, I didn't hear anything. Then she said, "Oh, honey, someday you'll be beating those boys off with a bat." Her voice was slight and cracking. I looked out from my covers to see tears running down her cheeks.

    Then I knew how much she suffered on my behalf. She had never let me see her tears.

    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