Reshared post from +Lifehacker
Ever wonder what's scratching your phone's "scratch-resistant" screen? It's probably the sand in your pocket, not your keys:
Your Keys Aren't Scratching Your Smartphone; It's the Sand in Your Pocket
Most modern smartphones use scratch-resistant glass on their screens, but every once in awhile you'll see that your phone still gets some fine scratches.
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Post imported by Google+Blog. Created By Daniel Treadwell.