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Well, animals with paws can scratch the screen. Cats and a bird video ("videos for cats" on youtube) are a particular vector on how to get your screen scratched...

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If you've got a problem with cat claws scratching glass, maybe you should return Battle Cat to He-Man. Normal earth cat claws are nowhere near hard enough to scratch glass...

It's the dirt under the cat's paws. Free-range kittys are very bad in this regard...

Glass? This is not the iPhone we're talking about, it's the Macbook Pro. The top layer of the screen is the polarizing filter, it's plastic and really not very scratch resistant.

That doesn't appear to be the case - it's just very thin glass.

http://www.anandtech.com/show/5998/macbook-pro-retina-displa...

https://www.ifixit.com/Teardown/MacBook+Pro+Retina+Display+T...

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