“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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Not to be nitpicky, but "—" is an em dash, a "–" is an en dash, and "-" is a figure dash (or hyphen).
An em dash is the width of an "M" and and en dash is the width of an "N" -- see the names are the clue.
If you are going to correct someone, try to ensure that you are right. ;)