“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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Richard, please don't take offense. I appreciate that you have reported this info.
Just spend a few minutes of detective work and you can find it. It took me less than 2 minutes to find this.
http://hatch.senate.gov/index.cfm?FuseAction=PressReleases.Detail&PressRelease_id=2001&Month=2&Year=2008