Introduction "There is nothing free in the world except air." We often hear this from people who complain that prices are getting high. It is ironic because air is such a vital part of the world and yet we tend to take it for granted. Have we ever stopped and actually thought of the importance of air? Only few of us will probably say yes. Air is so passive and inert that we actually forget …showed first 75 words of 3340 total…

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