Augusto Esquivel is a sculptor who, in his own words, is “crazy with comparisons of reality and potential and the balance between them.” Perhaps the best example of what he's talking about are his most famous creations: the suspended(悬挂的) button sculptures.

Made entirely from buttons hanging on various lengths of string, Esquivel's sculptures are made to look like common objects: a piano, a gumball machine, and even a toilet. If it wasn't for the clear string hanging above, these objects, these sculptures, would look solid, yet you can put your hands right through them. The process starts with him deciding on a subject and setting the acrylic （丙烯酸树脂）from where the buttons are being suspended. He buys buttons of different shapes and sizes, paints them with spray paint, and carefully hangs them. After that, it's a manner of hanging each individual button, which takes a lot of time. For his piano, for example, he individually hung over 60 pounds worth of tiny buttons.

Esquivel's sculptures, while mostly housed inside art galleries, perfectly capture one of the main principles of street art: something that is eye-catching and something that invites interaction. Often the best sculptures outside the art galleries aren't the ones behind guards and fencing, but the ones people can go right up to and touch. In Vancouver, a series of laughing old men are attracting people for pictures and to just generally hang around, but the people who simply walk by and see the sculptures almost always leave with a smile on their face. That's good street art: it draws the viewer in rather than relying on a gallery to draw in an audience and point them to certain pieces.

Esquivel's art is not only a presentation of talent, something that mentions larger philosophical questions, like the ones he stated above, but also just the right combination of interesting idea and painstaking work. One can look at his work in a critical way, or simply appreciate his idea and execution(艺术品的制作).

    Public Speaking Training

    Get a coach

{#blank#}1{#/blank#} so get help. Since there are about a billion companies out there all ready to offer you public speaking training and courses, here are some things to look for when deciding the training that's right for you.

    Focus on positives

Any training you do to become more effective at public speaking should always focus on the positive aspects of what you already do well. Nothing can hurt confidence more than being told that you aren't doing well.{#blank#}2{#/blank#} so good public speaking training should develop those instead of telling you what you shouldn't do.

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If you find a public speaking course that looks as though it's going to give you lots of dos and don'ts, walk away! Your brain is so full of what you're going to be talking about.{#blank#}4{#/blank#} As far as we're concerned, there are basically no hard and fast rules about public speaking. Your audience can be your friends.

    You are a special person not a clone (克隆人)

Most importantly, good public speaking training should treat you as a special one, with your own personal habits.{#blank#}5{#/blank#}Your training course should help you bring out your personality, not try to turn you into someone you're not.

A. You aren't like anybody else

B. You already do lots of things well

C. Turn your back on too many rules

D. Check the rules about dos and don'ts

E. Whatever the presentation, public speaking is tough

F. The one thing you don't want is for them to fall asleep

G. So trying to force a whole set of rules into it will just make things worse

    Have you ever cleaned and organized your increasingly high-tech households, your hard drive, phone or tablet? It's not just stuff. Your privacy needs a cleanup too. {#blank#}1{#/blank#}

    ⒈Clean up your browsers（浏览器）

    Cookies are blocking everything up and keeping your computer from running fluidly. A free program called CCleaner helps you sort out the cookies and archives（存档）you don't really need. {#blank#}2{#/blank#}. Cleaner analyses its backlog of information and lists the data that seems unnecessary.

    ⒉Speed up your smartphone

    Most of us already know about e desktops, but what about smartphones? Our phones are essentially handheld computers, and when they overflow with useless information, their operations can also slow down. These aren't necessarily apps, but overburdened call logs, search history, and saved texts.

    For Android users, there's 1Tap Cleaner, an app that earns its name. {#blank#}3{#/blank#} Most of us are surprised by how many updated messages and URLs get archived, a data stream that we will probably never refer to again. Then again, you do want to make sure irreplaceable bits (landmark texts, unsaved photos) survive the deep clean.

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    Digital photos are easy to shoot, upload and copy, which is handy in almost every respect, especially if you grew up lugging rolls of film to the one-hour photo lab. The downside is that you may end up with multiple copies of the same picture. If you're shooting with a decent camera, each shot could take 10MG or more of space. This volume adds up.

    {#blank#}5{#/blank#} This is the premise behind Duplicate Photo Fixer, which is designed to filter through your photo collection in search of double takes.

A. Make your photos shine.

B. The app gathers that data in one place, letting you decide what to keep.

C. This aim of this app is to clean your smartphones.

D. Remove redundant images.

E. When you download the app, you can focus on a specific browsers that you would like to clean up.

F. Here are three tools that can help you organize your virtual (and real) environments.

G. The trick is to safely delete redundant photos without losing the original image.

    There's nothing like a good night's sleep — but what does that really mean? It turns out that the answer depends not only on your age, but also on your lifestyle. Some people are productive and happy with fewer hours of sleep, while others need more. Still, experts can determine guidelines that work for most people. The National Sleep Foundation researched the topic and gave new recommendations this week. The foundation acknowledges that sleep needs will vary — lifestyle and stress should be taken into consideration — but their recommendations offer a general guideline. For example, teenagers (14 —17 years old) need 8—10 hours, sleep every day.

    To create the recommendations, some sleep and medical experts reviewed 312 articles from journals published during the last decade. This is the first time that any professional organization has developed age-specific recommended sleep durations based on a systematic review of the world scientific literature.

    A lack of sleep can be linked to weight gain, because that causes an increase in appetite, according to the foundation. It can also have serious consequences on the brain. People who do not get enough sleep are at increased risk for depression, and can endanger others. Those that become sleepy while driving, for example, risk both their lives and the lives of those around them.

    Researchers also have found in the past that too much sleep can have negative effects. Low socioeconomic status and depression reportedly are significantly associated with longer sleep. However, experts nowadays find that research on oversleeping is still unconvincing and needs more attention. Currently, there is no strong evidence that sleeping too much has health consequences. There is, however, laboratory evidence that short sleep durations of four to five hours have negative consequences. We need similar laboratory studies to determine whether long sleep durations result in physiological changes that could lead to disease before we make any recommendations against sleep extension.

    What happens inside the head of a soccer player who repeatedly heads a soccer ball. That question motivated a study of the brains of experienced players.

    Researchers at the Albert Einstein College of Medicine in New York selected 34 adults, men and women. All of the volunteers had played soccer since childhood and  now competed year﹣round in adult soccer leagues. Each filled out a detailed questionnaire developed especially for this study to determine how many times they had headed a soccer ball in the previous year, as well as whether they had experienced any known concussions in the past.

    Then the players completed computerized tests of their memory and other learning skills and had their brains scanned. using a complex new M.R.I. technique which can find structural changes in the brain that can't be seen during most scans.

    According to the data they presented, the researchers found that the  players who had headed the ball more than about 1, 100 times in the previous 12 months showed significant loss of white matter in parts of their brains involved with memory, attention and the processing of visual information, compared with players who had headed the ball less.

    This pattern of white matter loss is "similar to those seen in traumatic brain injury", like that after a serious concussion, the researchers reported, even though only one of these players was reported to have ever experienced a concussion.

    The players who had headed the ball about 1, 100 times or more in the past year were also generally worse at remembering lists of words read to them, forgetting the words far more often than players who had headed the ball less.

Perhaps you have seen them, those who fall asleep on the subway and then, somehow, wake up exactly at their stop. Perhaps you are one of them. How is this possible? We spoke to two doctors, who offered their insights about it.

It is possible that your body gets used to waking up at a certain point each time during your commute, said Dr. Marc I. Leavey, a primary-care specialist in Maryland. That holds especially true if you commute at the same time every day. This suggests that if you were to get on at a different time, or if the journey were delayed, your internal clock might not wake you up at your stop. It is an interesting theory, but Dr. Ronald Chervin, director of Michigan Medicine's Sleep Disorders Centers, does not fully buy it. He is skeptical that circadian rhythms can also explain why you wake up after a brief nap.

You are also likely to wake up for your particular stop because of an oral cue, such as the conductor stating the name of the subway stop over the public-address system. Such cues alert your brain that you have arrived, explained Dr Leavey. According to a study published in the Public Library of Science, during sleep, our brain reacts differently when we hear our own name and other people's names, noted Dr Chervin. This suggests that your brain does not turn off during sleep, which makes it possible to pick up on the announcement of your stop.

Another reasonable possibility: You may wake up at each stop, check if it is yours, and go back to sleep, all without having remembered it, added Dr. Chervin. He sees this in cases where patients are suffering from sleep apnea. They may wake up as many as 200 times during a single night, without having remembered a single instance. That's because they fall right back asleep before their brain has time to process their experience into long-term memory. Similarly, you could be waking up every time you hear a new stop called. But you just don't remember such instances even after you fully come awake for your stop—leading you to believe that you have slept the whole way through and miraculously woken up at the right time.