The Scanner broke and I had to think a lot about commas today...

This is what I learned:

"The en dash is slightly longer than the hyphen but not as long as the em dash. (It is, in fact, the width of a typesetter's letter "N," whereas the em dash is the width of the letter "M"—thus their names.) The en dash means, quite simply, "through." We use it most commonly to indicate inclusive dates and numbers: July 9–August 17; pp. 37–59."

And then I learned that there is no en OR em dash on the contemporary keyboard... only a hyphen. Unless, of course, you use the subtraction key.

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