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[narrating] "Disappearances happen in science. Disease can suddenly fade away, tumors go missing, and we open someone up to discover the cancer is gone. It's unexplained. Itâ€™s rare, but it happens. We call it mis-diagnosis. Say we never saw it in the first place, any explanation but the truth. That life is full of vanishing acts. If something that we didnâ€™t know we had disappears... do we miss it?"MEREDITH