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That's quite simple, you just need to remove the polarized layer from your computer screen and use new polarized sheets to make polarized glasses out of 3D glasses for example.
Only the person wearing the special glasses can see what's on screen, others will just see a blank monitor.

Better try that first on a used monitor you don't care about though...
 

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Maybe the most expensive one too…

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Remember the ‘how to fold a shirt in barely 2 seconds’ video? Well, there’s a better way to do it!
 

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This is how you make instant ice

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