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(Via Thiago Carvalho)"Then what is it information about, exactly? That issue, at the heart of quantum information theory, has not been resolved. Is it, for example, information about some underlying reality, or about the effects of our intervention in it? Information universal to all observers, or personal to each? And can it be meaningful to speak of quantum information as something that flows, like liquid in a pipe, from place to place? No one knows (despite what they might tell you). If we can answer these questions, we might be close finally to grasping what quantum mechanics means." Full column @ Nature News.