Humans have launched themselves into the outer space. They've landed on the moon. They've built habitable space stations that orbit the Earth. The next giant leap for mankind is to reach another planet – specifically, Mars.

    The problem is that it's no easy task. The planet is 586 times further away from the Earth than the moon, and it'll take around 180 to 220 days to reach Mars, depending on where each planet is in its orbit. Such long periods in space have suggested many potential health problems, including hormonal changes, skin conditions, and muscle and bone deterioration (损耗).

    Here's where some furry friends come in. A wide range of animals have been in space, from fruit flies and spiders to cats, and dogs. Such experiments began as far back as the late 1940s in first tests to see if living things could withstand the extreme g-force (重力) of a rocket launch.

    Mice continue to play a very important part in space experiments, mainly because the animals make excellent test subjects. They're small, which makes them inexpensive and easy to care for. In addition, their size and short life span make it possible to do the equivalent of several human years of tests in a much shorter time. Finally, because mice are mammals, they share many common characteristics with humans in terms of genetics, biology and behavior.

    Astromice have hit the headlines recently, as a team of scientists led by Betty Nusgens, professor of biology at the University of Liege in Belgium, found that the mice suffered a 15 percent thinning of their skin after 91 days aboard the International Space Station (ISS).

    This experiment was part of a wider NASA mission (任务) called the Mice Drawer System (MDS). The Italian Space Agency developed the facility, which allows six mice to be housed, monitored, and automatically fed and watered aboard the ISS, among which three survived during the mission.

    The mice have participated in 20 separate experiments, to study such effects as osteoporosis (骨质疏松症), anemia (贫血) and heart health.

    Results for the 20 experiments are coming in gradually. But it's clear that mice continue to play an important role in the ongoing quest to conquer the final frontier.

    Many animals recognize their food because they see it.So do humans.When you see an apple or a piece of chocolate you know that these are things you can eat.You can also use other senses when you choose your food.You may like it because if smells good or because it tastes good.You may dislike sonic types of food because they do not look,smell or taste very nice.Different animals use different senses to find and choose their food.A few animals depend on only one or their senses,while most animals use more than one sense.

    Although there are many different types of food,some animals spend their lives eating only one type.The giant panda eats only one particular type of bamboo.Other animals eat only one type of food even when given the choice. A kind of white butterfly will stay on the leaves of a cabbage,even though there are plenty of other vegetables in the garden.However,most animals have a more varied diet.The bear eats fruits and fish.The fox eats small animals,birds and fruits.The diet of these animals will be different depending on the season.

    Humans have a very varied（广泛的）diet.We often eat food because we like it and not because it is good for us. In countries such as France and Britain,people eat foods with too much sugar.This makes them overweight,which is bad for their health.Eating too much red meat and animal products,such as butter,can also be bad for the health. Choosing the right food,therefore,has become an area of study in modern life.

Show rooming

    One of the biggest challenges facing brick-and-mortar retailers(实体零售店) in recent years has been the "show rooming". Driven by the desire to get the best prices, many shoppers are now visiting brick-and-mortar stores to personally check on products that interest them, only to leave and then buy the items online. The new trend is forcing retailers to find out new ways to keep consumers from leaving their store for cheaper prices online.

    Recent research found that 40 percent of U.S. shoppers have shown roomed previously, with big-box retailers suffering the most. Specifically, the study shows that Best Buy, Walmart and Target are the most likely brick-and-mortar stores to have shoppers test out a product in-store and then purchase it online later, while Amazon is benefiting most from the practice, with nearly 60 percent of shoppers using the online retail giant(巨人) most often to make their show rooming purchases.

    Smart phones have pushed show rooming into the front. Shoppers no longer have to wait until they get home to see if they can find a cheaper price for the products they're considering buying. With smart phones, consumers can now compare virtual prices, at both other brick-and-mortar stores and online ones while still inside a retail store. If they can find what they're seeking for less online, the majority will be seeking the first exit. A recent study showed that 45 percent of customers shopping at brick-and-mortar stores walk out and buy their purchase online for a discount of as little as 2.5 percent.

    This puts pressure on retailers to provide both an in-store experience worth staying for and an online presence that can attract shoppers who are show rooming in other businesses.

    To cut down on show rooming, many retailers are adopting new methods to keep shoppers in their stores. Among the steps they're taking are price-matching guarantees that allow shoppers to pay a discounted price if they find it cheaper online. This ensures that even a show rooming shopper can make the purchase in the store—regardless of whether they find the cheaper price online.

    Another popular method to fight against show rooming is to give shoppers the ability to buy something online and pick it up at the store. This reduces shipping costs and gets customers in the store, where they may be encouraged to make an additional purchase.

    It is also important for businesses to take into consideration what makes shoppers purchase something in-store rather than online, and meet those needs. Research has found that more than 8 in 10 Americans consider being able to take the goods home immediately and the ability to touch and feel them—the most important aspects when deciding to purchase in a store rather than online.

    A linguist is always listening, never off-duty. I invited a group of friends round to my house, telling them that I was going to record their speech. I said I was interested in their regional accents, and that it would take only a few minutes. Thus one evening, three people turned up at my house and were shown into my front room. When they saw the room they were a bit anxious, for there was a microphone at head height, with wires leading to a tape-recorder in the middle of the floor. They sat down, rather nervously, and I explained that all I wanted was for them to count from 1 to 20. Then we could relax and have a drink. I turned on the tape-recorder and each in turn counted seriously from 1 to 20 in their best accents. When it was over, I turned the tape-recorder off and brought round the drinks. The rest of the evening was spent in total relaxation. I joined them in talking and joking freely, leaving them only to take a telephone call, which lasted some time.

    As a matter of fact, the microphones were not connected to the tape-recorder in the middle of the room at all but to another one in the kitchen. My friends, having seen the visible tape-recorder turned off, paid no more attention to the microphone which stayed in front of their chairs, only a few inches from their mouths, thus giving excellent sound quality. And my long absence meant that I was able to get as natural a piece of conversation as it would be possible to find I should add, perhaps, that I did tell my friends what had happened to them, after the recording was over, and asked them whether it should be destroyed. None of them wanted to—but for some years after that, it always seemed that when it came to buying drinks, it was I who paid for them. Linguistic research can be a very expensive business.

Summer Camps in Season!

    STEM Camp July 10 to August 14, Cost: $180

    90% of the jobs in the future will require STEM (Science, Technology, Engineering & Mathematics) education. We find ways to make learning fun and exciting for students to help ensure their futures. Campers participate in fun and engaging STEM activities! Register:www.stemcamp.ca or Call:519-475-6600.

    Kandalore June 15 to 28, Cost:$2，340

    The finest traditional camp in Canada, providing the best of both canoe(皮划艇)adventures and in-camp activities. For more than 65 years, Kandalore has given campers the opportunity to know and be themselves. We create a warm and supportive environment where kids can express their unique self, grow in self-confidence and build lifetime friendships. Register:www.kandlore.com or Call:416-322-9735.

    ESL Summer Camp June 25 to July 21, Cost: $5,500

    Pickering College has an exciting ESL summer camp for students aged 12-18 who want to learn English and experience the wonders of summer at our 42-acre campus; students enjoy the excellent dormitory, dining, academic, and social facilities of one of Canada's oldest independent schools. Register:www.pickeringcollege.ca or Call:905-175-8900.

DEEP Summer Academy August 16 to 26, Cost: $465

    We provide highly motivated high school students from across the world with the opportunity for advanced study in a variety of engineering, technology, business and science subjects. Organized by University of Toronto, DEEP is one of the most diverse pre-university engineering programs all over the world with scholarships. Register:www.outreachengineering.ca or Call:416-946-0816.

    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