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Edit by David Hodson

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[* black] Though the rear case is the last piece we reach, it's where the design of the new iMac began.
[* black] In order to carefully join together the two small halves of the case, Apple turned to [http://en.wikipedia.org/wiki/Friction_stir_welding|friction stir welding], a process previously reserved for applications such as ship building and aerospace.
[* black] Friction stir welding is more like joining clay than welding, in that it doesn't melt the workpieces, but rather heats the area between them and forces them together.