Alton Brown of Food TV’s Good Eats says that aluminum foil is dull on one side because it is rolled out in double sheets. And I always thought there was some useful reason it was that way. Want to know more about metal foil, or, more officially, “thin gauge metals”? There’s a website, of course, and this one’s called FoilCenter.com. Find out all about aluminum foil and how it’s made.