View full lesson here: http://ed.ted.com/lessons/a-brief-history-of-plural-word-s-john-mcwhorter All it takes is a simple S to make most English words plural...
TED TED-Ed TEDEducation \TED Education\, language, English, vikings, Norse, \Old, English\, \Olde, German, plurals, \plural, words\, \John, McWhorter\, Lippy