We’re used to the notion of things that in some sense contain information: books, computer memories, messages left on an answerphone. And we’re used to the idea that we can possess information: I can know your email address, say. And these seem distinct: one is potential knowledge, the other actual knowledge, culled from potential knowledge according to our individual capacity. But quantum mechanics seems to make the interaction two-way: knowledge we possess affects what is knowable (and to others, or just to us?). Yes, it’s confusing. But that is surely the right confusion to embrace, if we
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