The Burger Lab: Why Double Fry French Fries?

Now this is food science.

Eight years ago my mother sent me a fancy set of calipers in a vain attempt to draw me out of the dark depths of the restaurant kitchens and back to a much more sensible career like mechanical engineering or gunsmithing. Who knew that their inaugural run would be on a couple of potatoes?
Well mom, your gift has finally paid off.