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. But it hasn't always worked that way (and there are, of course, exceptions). John McWhorter looks back to the good old days when English was newly split from German -- and books, names and eggs were beek, namen and eggru!
Lesson by John McWhorter, animation by Lippy.