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A simple but clever design:

The Rotterdam Zoo is giving away cardboard glasses that make it appear that you’re looking off to one side; these are gorilla-viewing glasses, meant to avoid incidents in which gorillas attack visitors for making eye contact with them. The glasses’ introduction follows an attack on a woman by an escaped gorilla.

It's also useful when visiting tea-party rallies, I'm told.

(Hat tip: Geekologie)

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