Yes, pop-ups can be a bit annoying but they are very effective.

http://google.vu/url?q=http://nei.instructure.com/eportfolios/13114/

http://www.google.li/url?q=http://uthscsace.instructure.com/eportfolios/12356/

http://images.google.co.hu/url?q=http://flatironschool.instructure.com/eportfolios/280/


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