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\vspace{2mm}  A. Bogomolny, History of the Binary System from Interactive Mathematics Miscellany and Puzzles  http://www.cut-the-knot.org/do_you_know/BinaryHistory.shtml, Accessed 01 March 2016 \vspace{2mm}  Ghose, T. (2013, December 16). Math Surprise: Remote Islanders Invented Binary Number System. Retrieved March 01, 2016, from http://www.livescience.com/41985-binary-math-invented-before-leibniz.html