If you ever wondered how the smooth and shiny finish of Apple products is achieved in manufacturing, here's your answer. The process called anodizing makes metals such as aluminum and titanium corrosion-resistant by growing an oxide layer into the metal.
A nice clip based on a chapter in the book Eight Amazing Engineering Stories explains the anodizing process in Layman's terms through the mouth of Bill Hammack the Engineer Guy.
As you know, anodizing is used on many Apple products, including most of the Macs sold today, and is likely to be applied to an upcoming iPhone 5 said to feature metal-clad back...