http://www.inc.com/larry-kim/avoid-this-one-punctuation-habit-that-will-destroy-your-credibility.html
I am very guilty of this your honour !!!
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From texting to tardiness to cheating, incivility and misconduct can disrupt learning. Here are some tips for controlling a class.
http://cgi.stanford.edu/~dept-ctl/cgi-bin/tomprof/enewsletter.php?msgno=1375