Cars are changing because they have to. They have to become lighter, safer, and more efficient. This may make the hardcore purists cringe, but we may all be better off for it in the end.

That's our question of the day: What technology will revolutionize car manufacturing in the years to come?

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Here's one example: the mad scientists at Local Motors just turned a block of plastic into a car using 3D printing. How awesome is that? It's clearly in its earliest stages, but it's fascinating to think where 3D printing could go.

Your turn. What technology or concept will change the way cars are made?