Get chemical elements with and without boiling point data from Freebase

In response to my question on the Freebase developers list [Developers] how to get items with properties having null values?, Chris Maden of Metaweb quickly wrote me the following solution: To find all elements *with* boiling points: [ { "atomic_number" : null, "boiling_point" : { "value" : null }, "name" : null, "sort" : "atomic_number", […]

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