A printed temperature control log with two columns per day, signed once in the morning and once in the evening, always by the same person.

What you thinkThe temperature records are meticulously kept, unbroken for over two years. The last sign-in was on the morning of the disaster, with handwriting as neat as always. Below that should have been one more slot for the evening shift—it's empty. On the back of the form, someone used a pencil to calculate something: a number multiplied by seventeen, then crossed out and changed to twenty-four.

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