Star Wars Secret and Anatomy of an Attack

https://www.reddit.com/r/explainlikeimfive/comments/3pni12/eli5_what_would_our_vision_be_like_if_we_had_a/
What would our vision be like if we had a third eye at the back of our head?

https://en.wikipedia.org/wiki/Email_loop
If one such automatic response triggers another automatic response on the other side, an email loop is created.

https://en.wikipedia.org/wiki/Molyneux%27s_problem
“if a man born blind can feel the differences between shapes such as spheres and cubes, could he, if given the ability to see, distinguish those objects by sight alone, in reference to the tactile schemata he already possessed?”

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