Why dual-screen laptops are twice as good

Silicon Valley investor Marc Andreessen famously said: "Software is eating the world."

That still rings true.

But there's some munching going on in the hardware world as well: Screens are eating our mobile devices. Smartphone makers are racing to be first to the zero-bezel smartphone finish line. And in the laptop market, companies are scrambling to figure out how to put screens on both sides of the clamshell.

The reason is obvious: While physical keyboards are superior for typing, screens are superior for every other kind of interface. By adding a second screen to a laptop, you transform what it is, how it works and what you can do with it.

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