Naturally many people have deduced what has happened: There has been such a dramatic change in Ministry policy in the last few days, and many are whispering that Voldemort must be behind it.
From all of these things, Harry deduced that Ginny, and probably Neville and Luna along with her, had been doing their best to continue Dumbledore’s Army.
Luna was not there: The thing that was making such a racket was a wooden object covered in magically turning cogs and wheels, It looked like the bizarre offspring of a workbench and a set of shelves, but after a moment Harry deduced that it was an old-fashioned printing press, due to the fact that it was churning out Quibblers.
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She trusts only what she can measure or can deduce from measurement.
Now let us consider the situation and see what may be deduced from it.
Arthur Conan Doyle -- The Adventures of Sherlock Holmes