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That's pretty neat. Didn't know that. Thanks!

And if you set num=0 then it returns the normal "did not match any documents" page: https://www.google.com/search?num=0&q=temperature+london

Which seems like it could be used to fool someone into thinking there really are no results for a subject.

Or to pretend Google search is broken ;)

Or tell the truth about the truth ;)