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DuckDuckGo made sunglasses that do absolutely nothing, and they sold out
(www.techspot.com)
This is a most excellent place for technology news and articles.
But of course it does something. It blocks light, and let a man stare at boobs discreetly.
Hey, don't be sexist... They also let women stare at boobs discreetly
You're right. Women also like to stare at boobs.
Another use case I failed to mention: staring at butts.
So they are perv glasses.