unbelievable-facts:A riddle from 1688 goes: “If a man born blind…

unbelievable-facts:

A riddle from 1688 goes: “If a man born blind can feel the differences between shapes such as spheres and cubes, could he, if given the ability, distinguish those objects by sight alone?” In 2003 the riddle was solved when five people had their sight restored through surgery. They could not.

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