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Attestor can be defined as a person who attests to the genuineness of a document or signature by adding their own signature. In today’s world there has been some major trends that have been immensely influential in the computing environment. The first that I would like to talk about is heterogeneity. We use to compute using everything from small cell phones, to handhelds, to desktop workstations, to rack-mounted servers and all the aforementioned need to inter-operate. This in one way or the other has led to widespread acceptance of open protocols for communication and portable language runtimes (such as Java and net virtual machines for programs performance. The second major trend is mobility. Not only must all these varied computing devices inter-operate seamlessly, we must also be able to use most of our familiar programs and data across all of them. Both of these have significantly increased the importance of having a so-called ``common platform''. This common platform i

(https://cdn.steemitimages.com/DQmWtZHuz4SMw1jxcqLX5rjdJsMJrJcndsdRvsgkf5rnQ79/Screenshot_32.png) Globally, football remains the most popular of all sports. Widespread interest in the game as well as involvement - through participation and spectating, means it continues to lead the way, with an estimated 270 million people involved worldwide (Conmebol 2013). In England; the birthplace of the sport, exponential growth in interest means around 20% of all adults play football regularly (The FA 2015). Furthermore, in places where it is not the most popular sport; take for example the U.S.A, it is continuing to increase in popularity. In the United States, a precipitous rise in young persons’ involvement has seen the number of registered US youth players surpass three million (US Youth Soccer 2015). In Australia, the game has seen rapid growth over a short period of time, and has surfaced as the most engaged in activity, surpassing more traditional and indigenous sports. A 2015 survey sh

In a solid waste management, there is nothing like throwing away waste. When dumping or throwing away/discarding waste, the systems complexities and the integrated nature of materials and pollution are quickly apparent. For instance, if we take waste incineration, it is expensive and imposes challenges of air pollution and ash disposal. Incineration in one way or the other requires waste placed outside for collection to be containerized to stay dry and much of the waste stream is not combustible. Moreover, waste collection vehicles are large sources of emissions. Uncollected waste can provide breeding areas and food to potentially disease carrying vectors such as insects and rodents. Waste management cannot be effectively managed without due consideration for issues such as the city’s emissions, labor market, land use planning and myriad related concerns. Despite progress in solid waste management practices in the decade since years back, there are certain pertaining issues about env