Why ETFE Is the Miracle Construction Material

Why ETFE Is the Miracle Construction Material ETFE is an abbreviation for Ethylene Tetrafluoroethylene, a  translucent polymer sheeting that is used instead of glass and hard plastic in some modern buildings. ETFE is usually installed within a metal framework, where each unit can be lighted and manipulated independently. Light sources can be on either side of the plastic cladding. Compared to glass, ETFE transmits more light, insulates better, and costs 24 to 70 percent less to install. ETFE is only 1/100 the weight of glass, and it has properties that make it more flexible as a construction material and a medium for dynamic illumination. Key Takeaways: ETFE ETFE (Ethylene Tetrafluoroethylene) is an industrial-strength construction plastic used for exterior cladding since the 1980s.ETFE is strong and lightweight. It is often applied in layers that are welded together around the edges and held by a metal framework. Because it is safer and more adaptable than glass, non-rip ETFE is often used as a replacement for glass.Commercial uses of ETFE include many sports arenas and entertainment venues. Dynamic lighting of this plastic has been a successful feature of ETFE architecture. Uses of ETFE The SSE Hydro in Scotland, part of the design portfolio of British architect Norman Foster, was completed in 2013 as an entertainment venue. In the daylight, the ETFE cladding may lack excitement but be functional by allowing natural light to the interiors. After dark, however, the building can become a light show, with interior lighting shining out or exterior lights around the frames, creating surface colors that can be changed with the flip of a computer program. For other venues, rows of lights surround the plastic panels. The ETFE cusions on the Allianz Arena in Germany are diamond shaped. Each cushion can be controlled digitally to display red, blue, or white lights - depending on which home team is playing. ETFE Exterior Panels on the Allianz Arena. Lennart Preiss/Getty Images This material has been called a fabric, a film, and a foil. It can be sewn, welded, and glued together. It can be used as a single, one-ply sheet or it can be layered, with multiple sheets. The space between the layers can be pressurized to regulate both insulating values and light transmission. Light can also be regulated for local climates by applying nontransmittable patterns (e.g., dots) during the manufacturing process. With dark dots imprinted on the translucent plastic, light rays are deflected. These application patterns can be used in conjunction with layering - using photo sensors and computer programs, the location of the dots can be strategically moved by controlling the air between layers, by stretching or sagging the material, which positions the dots to block where the sun is shining through. Allianz Arena Dynamic Lighting. Lennart Preiss/Getty Images (cropped) Computer systems can also regulate dynamic lighting effects for ETFE structures. When the exterior of the Allianz Arena is red, FC Bayern Munich is the home team playing in the stadium - their team colors are red and white. When the TSV 1860 Mà ¼nchen soccer team plays, the colors of the stadium change to blue and white - that teams colors. Characteristics of ETFE ETFE is often called a miracle construction material for tensile architecture. ETFE is (1) strong enough to bear 400 times its own weight; (2) thin and lightweight; (3) stretchable to three times its length without loss of elasticity; (4) repaired by welding patches of tape over tears; (5) nonstick with a surface that resists dirt and birds; (6) expected to last as long as 50 years. In addition, ETFE doesnt burn, although it can melt before it self-extinquishes. Because of its strength and ability to transmit UV rays from the sun, ETFE is frequently used in sports venues that desire healthy, natural turf athletic fields. Disadvantages of ETFE Everything about ETFE is not miraculous. For one thing, it is not a natural building material - its plastic, after all. Also, ETFE transmits more sound than glass, and can be too noisy for some places. For a roof subject to raindrops, the workaround is to add another layer of film, thus decreasing the deafening drumbeats of rain but increasing the construction price. ETFE is usually applied in several layers that must be inflated and require steady air pressure. Depending on how the architect has designed it, the look of a building could drastically change if the machines that supply the pressure fail. As a relatively new product, ETFE is used in large commercial ventures - working with ETFE is too complex for small residential projects, for the time being. The Full Life Cycle of Building Materials How is it that a synthetic plastic film has come to be known as the building material of sustainability? When choosing building products, consider the life cycle of the materials. For example, vinyl siding may be recycled after its usefulness, but what energy was used and how was the environment polluted by its original manufacturing process? Concrete recycling is also celebrated in the environmentally friendly construction world, but the manufacturing process is one of the prime contributers to greenhouse gasses. A basic ingredient in concrete is cement, and the U.S. Environmental Protection Agency (EPA) tells us that the manufacturing of cement is the third largest industrial source of pollution in the world. When thinking of the life cycle of glass production, especially compared to ETFE, consider the energy used to create it and the necessary packaging to transport the product. Amy Wilson is explainer-in-chief for Architen Landrell, one of the worlds leaders in tensile architecture and fabric systems. She tells us that manufacturing ETFE causes little damage to the ozone layer. The raw material associated with ETFE is a class II substance admitted under the Montreal treaty, Wilson writes. Unlike its class I counterparts it causes minimal damage to the ozone layer, as is the case for all materials used in the manufacturing process. Reportedly creating ETFE uses less energy than making glass. Wilson explains: The production of ETFE involves the transformation of the monomer TFE in to the polymer ETFE using polymerisation; no solvents are used in this water based procedure. The material is then extruded to varying thicknesses depending on application; a process which uses minimal energy. Fabrication of the foil involves welding large sheets of the ETFE; this is relatively quick and again a low energy consumer. Because ETFE is also recyclable, the environmental  culpability is not in the polymer, but in the aluminum frames that hold the plastic layers. The aluminium frames do require a high level of energy for production, Wilson writes, but they also have a long life and are readily recycled when they reach their end of life. Examples of ETFE Structures A photo journey of ETFE architecture quickly dispels the notion that this is a simple plastic cladding material you might put over your roof or boat on a rainy day. The Swiss architecture team of Jacques Herzog and Pierre de Meuron created a sculpted look for the Allianz Arena (2005), one of the most beautiful ETFE structures in Mà ¼nchen-Frà ¶ttmaning, Germany. Mangrove Hall (1982) at Royal Burgers Zoo in Arnhem, the Netherlands, is said to be the first application of ETFE cladding. The Water Cube venue (2008) built for the Beijing, China Olympics brought the material to the attention of the world. The biodome Eden Project (2000) in Cornwall, England created a green tinge to the synthetic material. Allianz Arena Designed by Herzog de Meuron, 2005, Munich, Bavaria, Germany. Chan Srithaweeporn/Getty Images (cropped) Because of its flexibility and portability, temporary structures such as the summer Serpentine Gallery Pavilions in London, England have been of late at least partially created with ETFE; the 2015 pavilion in particular looked like a colorful colon. The roofs of modern sports stadia, including the U.S. Bank Stadium (2016) in Minneapolis, Minnesota, are often ETFE - they look like panes of glass, but the material is really safe, non-rip plastic. Temporary Summer Pavilion in Londons Hyde Park by Spanish Architects Josà © Selgas and Lucia Scano, 2015. Lionel Derimais/Getty Images (cropped) Plastics, the Industrial Revolution Continues The du Pont family emigrated to America shortly after the French Revolution, bringing with them 19th century skills in making explosives. Using chemistry to develop synthetic products never stopped within the DuPont company, creators of nylon in 1935 and Tyvek in 1966. When Roy Plunkett worked at DuPont in the 1930s, his team accidentally invented PTFE (polytetrafluoroethylene), which became Teflon. ® The company, who considers themselves a pioneer of polymer science with a legacy of innovation, is said to have created ETFE in the 1970s as an insulation coating for the aerospace industry. The tensile architecture of Prizker laureate Frei Otto in the 1960s and 1970s was an inspiration for engineers to come up with the best material to use for what builders and architects call cladding, or the material that we might call exterior siding for our homes. The idea for ETFE as a film cladding came in the 1980s.  Engineer Stefan Lehnert and architect Ben Morris co-founded Vector Foiltec to create and market Texlon ® ETFE, a multi-layered system of ETFE sheets and architectural cladding. They didnt invent the material, but they did invent the process for welding together sheets of ETFE - and giving a building the layered look. Sources Birdair. Types of Tensile Membrane Structures. birdair.com/tensile-architecture/membraneBirdair. What is ETFE film? birdair.com/tensile-architecture/membrane/etfeDupont. History. dupont.com/corporate-functions/our-company/dupont-history.htmlDupont. Plastics, Polymers, and Resins. dupont.com/products-and-services/plastics-polymers-resins.htmlEPA. Cement Manufacturing Enforcement Initiative. https://www.epa.gov/enforcement/cement-manufacturing-enforcement-initiativeWilson, Amy. ETFE Foil: A Guide to Design. Architen Landrell, February 11, 2013, architen.com/articles/etfe-foil-a-guide-to-design/, architen.com/wp-content/uploads/architen_files/ce4167dc2c21182254245aba4c6e2759.pdf

8 Rules About Punctuation and Quotation Marks

8 Rules About Punctuation and Quotation Marks 8 Rules About Punctuation and Quotation Marks 8 Rules About Punctuation and Quotation Marks By Mark Nichol The use of full or partial quotation marks or of paraphrases calls for attention to detail and adherence to a few punctuation rules. Notice that the examples below are deliberately incorrect. 1. â€Å"Most agree the word means something like: This stream meanders through something red.’† The words in the quotation collectively serve the grammatical function of a noun and are not set off from the attribution by a comma or a colon. 2. â€Å"The motto, ‘Might makes right’ applies here.† In this similar case, â€Å"the motto† is an appositive for â€Å"Might makes right,† just as in â€Å"the Web site DailyWritingTips.com,† â€Å"the Web site† is an appositive of the site’s name: â€Å"The motto ‘Might makes right’ applies here.† To insert a comma implies that this is the only existing motto (though there should then be one after right as well to complete the restrictive phrase). 3. â€Å"According to the book, at the first sign of an outbreak, ‘Children were whisked home from summer camps in the middle of the night.’† If an incomplete quotation is completed by a preceding paraphrase, lowercase the first word of the partial quotation unless it is a proper noun. In this case, â€Å"at the first sign of an outbreak† substitutes for the missing introductory phrase: â€Å"According to the book, at the first sign of an outbreak, ‘children were whisked home from summer camps in the middle of the night.’† In scholarly writing, the first letter of children should be bracketed to clarify that it was capitalized in the original source, but that nicety is unnecessary in general. 4. â€Å"He concluded that what America needs most is a â€Å"guiding belief† for citizens, industry, and government.† This sentence is essentially correct, but when a partial quote consists of such a brief phrase, ask yourself whether the quotation marks are justified; why not just paraphrase the entire sentence?: â€Å"He concluded that what America needs most is a guiding belief for citizens, industry, and government.† 5. â€Å"Her response was that she had ‘definitely locked the door on my way out.’† A writer might deem it crucial to retain a partial quote, but if the speaker uses the first person, the quotation won’t fit the reportorial third-person framing, and a paraphrase is necessary: â€Å"Her response was that she had definitely locked the door on her way out.† (Alternatively, you could paraphrase part of the direct quote â€Å"Her response was that she had ‘definitely locked the door’ on her way out† but, again, with diminishing returns.) 6. â€Å"The question is which selection is better?† This is a conjectural question not literally stated, so it is only tangentially related to the other examples here, but it’s important to point out that such constructions should include a comma: â€Å"The question is, which turnoff did she take?† (However, when the sentence is not stated as a question, the comma should be omitted: â€Å"The question is which selection is better.†) 7. When asked to clarify his earlier statement, he said: ‘I have nothing to add.’† Writers frequently introduce a statement with a colon rather than a comma, but this construction is awkward, because a colon invites the reader to put on the brakes, rather than just slow down, a fleeting action the more flexible comma invites: â€Å"When asked to clarify his earlier statement, he said, ‘I have nothing to add.’† (See also the second example, above.) Do retain the colon, however, when the attribution is an independent clause, as here: â€Å"He made this shocking public statement: ‘I think there is a fair chance Perth will be the twenty-first century’s first ghost metropolis.’† 8. â€Å"‘This [the subway bombing] is a minor thing that will develop into something major,’ she added.† When scholarly standards or journalistic integrity demands an exact quotation, but a full statement isn’t available, here’s the conventional but clunky solution: Provide the rest of what the speaker or writer meant to say or the definite noun they didn’t provide in order to fortify your class or reporting assignment within brackets. But note that the bracketed insertion should replace, not supplement, the indefinite subject: â€Å"‘[The subway bombing] is a minor thing that will develop into something major,’ she added.† Alternatively, especially in less-than-formal contexts (or even in newspaper reporting I won’t tell), feel free when you are certain of the intended specifics to employ a handy technique called silent correction. In other words, bail on the brackets: â€Å"The subway bombing is a minor thing that will develop into something major,† she added.† Want to improve your English in five minutes a day? Get a subscription and start receiving our writing tips and exercises daily! Keep learning! Browse the Punctuation category, check our popular posts, or choose a related post below:10 Grammar Mistakes You Should AvoidCapitalization Rules for the Names of GamesDozen: Singular or Plural?

Report of Marketing Campaign review-Vodafone New Zealand PXT service Essay

Report of Marketing Campaign review-Vodafone New Zealand PXT service - Essay Example Vodafone Group was established in the United Kingdom back in 1983. The company acquired its New Zealand business – previously known as BellSouth New Zealand in November 1998. At the time Vodafone Group made the purchase, BellSouth had a total of 138,000 customers. As of June 2006, Vodafone New Zealand had a customer base of 2.1 million customers that is composed of 55% share of the New Zealand mobile market.1 The competition in the New Zealand mobile market is very tight. For this reason, the company needs to constantly upgrade its system such as PXT messaging. In 2001, Vodafone New Zealand signed up a commercial agreement with Telecom New Zealand today in order to enable their customers to send sound enables photo and video messages between the two mobile networks.2, 3 Vodafone New Zealand introduces its free weekend use of PXT messaging as a marketing campaign between the periods of December 2003 until September 2004.4, 5 Vodafone PXT â„ ¢ uses this strategy with the attempt to boost the demand for multimedia messaging. Since January 2004, the PXT messaging across the Vodafone network has increased at a rate between 35 – 50% month-on-month despite the price of 75 cents per message.5 In line with the increase in the use of PXT messaging, the sales of more featured phones were also increasing. Vodafone used the GO-Race (Loo-Racer) as a unique way of launching the new PXT capable phones. This event was featured on 30 second TV commercial throughout New Zealand and Australia together with some print ads campaign. This campaign was successful in reaching for Vodafone’s target market. There is only one competitor in the New Zealand mobile industry – The Telecom NZ because of the high cost of infrastructure requirements. This also becomes a barrier to exit. Due to globalisation, it is still possible for International Telecommunications Company to penetrate the industry

How Do Infrastructures Sape Cultures of Consumption Essay

How Do Infrastructures Sape Cultures of Consumption - Essay Example This essay stresses that the government of a country provides Infrastructure Services like Transport, Water & Electricity to promote well being of the citizens and hence will be committed to subsidize the cost to the consumers in order to make them reachable to the most unprivileged in the society. However, it needs to be clearly communicated that Infrastructure Services resulting in consumption of natural resources (like water) that is of utmost environmental importance should not be treated as a product which can be availed as per personal choice without any commitment to the larger community & the environment. The consumers would have to be educated on the bigger picture such that they assume larger accountabilities of preservation of the natural resources thus helping in reducing wastage. This can be done by promoting products & services that help in waste reduction without compromising on the day to day lifestyle goals of the individuals. Moreover the services are allowed to be controlled by non-profit organizations such that the cause of environment protection is higher on agenda than the revenues from services. This paper makes a conclusion that the design of end user utility services in large buildings & households should be done in such a way that manual avenues of saving natural resources (like water) should be provided along with signage or short instructions rather than controlling wastage through automatic means. Human behaviour would override the automatic systems more often thus resulting in more wastage than conservation.

Summative Assessment In Education Research Paper

Summative Assessment In Education - Research Paper Example Why is it important to use authentic materials when teaching the English language? (3 marks) 2. Name six of the materials that can be used to supplement a course book when teaching English. (3 marks) 3. Discuss four methods which can be used to make a lesson more lively (4 marks) 4. Mention five advantages of using a course book while teaching (5 Marks) 5. Mention five best practices associated with the use of a course book (5 Marks) 6. Discuss the four options for use of a course book (8 marks) 7. Give four reasons why it is important to plan a lesson (2 marks) Section B: Lesson plan (30 marks) 1. With the news article and blank lesson plan provided, devise a lesson plan that can be used to teach a certain aspect of grammar. You are free to choose any aspect of your interest, but the lesson plan should include all the stages. Make sure all spaces are filled. Teacher: Room: Observer: Expected numbers: Date & Time: Class Level: Context: Teaching Aids: Learner Objectives: Personal Aims : Anticipated problems for students: Solution: Anticipated problems for teacher: Solution: Procedure Phase Timing Interaction (â€Å"Online TESOL / Online TEFL ITTT Answers†, 2009) Section C: Essay questions (40 marks) Write an essay of about 500 words to discuss one of the following concepts 1. Use a course book in lesson planning to maximize effects. 2. An ideal lesson plan. 3. Benefits of using a lesson plan. Note: your essay must contain a brief introduction and a conclusion. An assessment Triangle and cognitive Learning model In creating my summative assessment, I relied on the concept of the assessment triangle and the cognitive learning model. According to Selah & Khine (2011), the mentioned can provide a guide which helps, when an assessment instrument to support reasoning from evidence is designed, which is my objective. At this point, I feel that it is necessary to apply the concept of an assessment triangle where I considered all its elements. One of the elements o f an assessment triangle that I critically analyzed is cognition. Cognition refers to the theory, data, and a set of assumptions about how student present their knowledge and develop competency in a subject matter domain (Bernholt, 2012). Using the concept I try to align my summative assessment in the best possible way to make it test the level of competency my students have developed during the learning process. To understand this cognitive behavior fully, I decided to use the cognitive learning model. According to Busemeyer & Diederich (2010), this model has a goal of scientifically explaining processes used by the human brain to accomplish complex tasks. Using this model, I was able to understand the cognitive behavior of my students. This has helped me a lot in designing this summative assessment by showing me how the students behaviors interact with the goals we want to achieve through this summative assessments. Another element of as assessment triangle that I have considered is the beliefs element.

Torsional pendulum final experiment Essay Example for Free

Torsional pendulum final experiment Essay To improve reliability of my results I will perform 3 runs for each measurement rather than 1, this will allow me to average the 3 results for each measurement which will improve reliability of results, and if there is one of the 3 that does not fit it can be excluded and average the other 2. I will no longer need to do 5 oscillations and then divide by 5 as the accuracy of the readings by the light gate ensures that the experimental error will already be eliminated as human error and reaction time no longer applies. Â  I will scale up parts of the experiment which produced larger than expected error. Therefore I will use a larger diameter of wire, which will therefore reduce the percentage error as the accuracy of the micrometer will still be the same. Â  The time period was where the majority of the errors occurred in the preliminary. Therefore I am going to use a light gate to measure the time period, this will reduce error on the time period significantly. It will eliminate the human error as the error due human reaction time will no longer apply. There will only be a reading error now, which is far less significant than the experimental error. I will use a range of lengths from 100-500mm rather than 100-800mm, as when the length becomes very long the bar on the bar on the wire tends to wobble a lot more than when a shorter length is used. Therefore I am hoping this will further reduce the error in the time period. I will go up by 50mm each time so that I get a suitable number of results. Aim: Investigate the effect of changing the length of wire on the time period for a Torsional pendulum. Equipment: Â  Retort Stand with clamp to hold the wire and bar when oscillating and to hold the motion sensor. Bung cut into two halves so I can change length of the wire easily and hold the wire tightly. Â  Metal Bar which will move through the motion sensor to give time periods. Approximately 0. 700,m long wire( extra 200mm to allow for tying wire and excess at top of clamp to easily be able to change length) Â  Laptop with Sensing science (graph) software which logs the data in real time. Â  Light gate including easy sensor and cables, this will measure the time period. Micrometer to measure diameter of the wire. Â  Meter long ruler to measure out correct lengths of wire and measure length of the bar. Diagram: Fair test. It is important to make the experiment fair to ensure reliability of results. The following must be considered when carrying out my experiment. Â  Ensure the same bar is used for each run so that these constants (mass and length) dont change. Ensure the diameter of the wire is the same for the whole length, take readings at regular intervals on the wire to be sure. Turn 90 degrees anticlockwise for each time period measured, as the twist on the wire will be different otherwise. Also ensure that before turning 90 degrees that the wire and bar are in the equilibrium position, 0 angular displacement / no twist. Theory: As I predicted in the preliminary I expect the time period to increase as the length of wire increases, this is due to the equation derived in my research above. T=2? Where theoretically the relationship between time period and length should be T? L0. 5. However, from the equation I can see that the diameter is to the power of 4, therefore even a very small change in diameter will cause a major difference in the time period, therefore using a greater diameter will cause the denominator to be much larger and so the overall time period will be significantly lower. For example I will expect the time period for 0. 1m to be significantly less than 6. 162s, which is obtained from the preliminary using a smaller diameter. Using the theory above I can make a predicted graph of what I am expecting from my log log graph, by simply putting the lengths into the formula, as I already have the measured diameter of wire, length and mass of bar. This is what I obtained. This shows that I should obtain exactly 0. 5 as the gradient and the R squared correlation should be as close to 1 as possible to represent a strong correlation Method: Â  Set up the apparatus shown above, connect lead into laptop and open sensing science software, select com1. Set the time to 30 seconds and tick light gate sensor.* Measure the length of the bar using a meter ruler and the mass using a scale. Â  Get two 700mm copper wires and tie them together ensuring that the diameter is constant for the whole length. Then connect the wire to the metal bar, attach the wire to the bung and tighten. Measure the diameter of the wire at a few intervals and ensure that it is the same, record this diameter. Rotate the bar 90 degrees anticlockwise and let go, and at the same time press on run on the laptop. Allow the bar to complete 3 oscillations; this would be 2 peaks, 3 times, as shown below. Once 3 oscillations are complete then click the stop button. Click on interval and hold and drag from one peak to 2 peaks later, this will give you the time period for one oscillation. Record this in a suitable format and do the same for the next 2 oscillations. Â  Repeat this process for lengths 100-500mm going up by 50mm each time, this will ensure I have enough results to be able to have a good graph. Results: As you can see from the first graph without the logs, the relationship is that an increase in length causes an increase in time period. This was the prediction I made and also that the time periods would be significantly less than the preliminary due to a greater diameter of wire. I also added an R squared value to my log log graph; this gives me the strength of the correlation. With 1 being the highest, mine was 0. 9868, which shows very strong correlation.

An Inside Look at Shark Finning Essay -- detrimental practices, environ

Every summer, when parents take off work and kids are out of school, families plan a summer vacation. 42% of those vacations take place on sandy beaches underneath the summer sun. Americans splash in the waves, sip refreshing drinks under their oversized umbrellas, build sandcastles, and revel in a beach tan that will hopefully last them all summer. While eating seafood and enjoying the beach can be viewed as the ultimate summer vacation, humans impact our oceans more than we think, and it’s much more catastrophic than spending our summer vacations at our favorite beaches. There are currently over 440 species of sharks in our Earth’s oceans, but despite roaming our ocean’s waters for millions of years, sharks are constantly at risk of extinction. It is estimated that one hundred million sharks are killed by humans each year. To put it into perspective, that’s 11,417 sharks killed every hour. Meanwhile, only 12 humans were killed worldwide by sharks in 2011. The culprit behind the extremely high rate of shark deaths is the practice of shark finning. â€Å"Shark finning is the practice of slicing off the shark’s fins while the shark is still alive and throwing the rest of its body back into the ocean where it can take days to die, which must be an agonizing death.† The shark fins are used in an Asian delicacy known as â€Å"shark fin soup.† In many Asian countries, it is a sign of wealth and prosperity and is often served and banquets and weddings to impress the guests. Just one bowl of shark fin soup can cost u p to $100. Because of the high demand for shark fin soup, fishermen and middlemen alike have been finning sharks any chance they get. Although the shark fins are used in shark fin soup, they are also sold frozen, canned or dried. The... ...cean Bycatch Campaign. N.p., 31 Oct. 2002. Web. 10 May 2014. "Mercury Contamination in Fish : Mercury and Its Effects." NRDC. Natural Resource Defense Council, n.d. Web. 8 May 2014. Mosbergen, Dominique. "How Many Sharks Are Killed Per Hour? This Graphic Will Shock You (INFOGRAPHIC)." The Huffington Post. TheHuffingtonPost.com, 27 Mar. 2013. Web. 14 Apr. 2014. Orchant, Rebecca. "Threatened Species Used In Shark Fin Soup Across U.S." The Huffington Post. TheHuffingtonPost.com, 10 Aug. 2012. Web. 14 Apr. 2014. "Sea Shepherd Conservation Society." Sea Shepherd. N.p., n.d. Web. 10 Apr. 2014. . "Stop Killing Our Sharks!" Shark Angels. N.p., n.d. Web. 10 Apr. 2014. . "What You Need to Know about Mercury in Fish and Shellfish." US EPA. United States Environmental Protection Agency, 18 June 2011. Web. 9 Apr. 2014.