I've been envious of the iPhone over the last few years for one, not-so-obvious reason: Apple makes its recent flagships out of stainless steel. Here in the land of Android, the best we can really hope for is aluminum and glass, but there's a whole wide variety of premium, super-durable, and exotic materials out there phones could use. So, why are almost all Android smartphones boring glass and plastic or aluminum slabs? I was able to speak with Kinder Liu, COO and Head of R&D at OnePlus, to find out.

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