Google Knowledge Graph has more than one billion entities and more than 70 billion facts about these entities (people, places, things). It's huge and it brings a different dimension to search: understanding concepts and the relation between them.
Mobile Google Search now has a section called "found in related search", which shows a few entities frequently mentioned in other related searches. For example, I searched for [ethanol molar mass] and Google showed 2 lists of organic and inorganic compounds: one of them was found in the related search [properties of alkanes] and the other was for [polar solvents]. Ethanol is a polar solvent which can be obtained from alkenes, while alkenes can be derived from alkanes, so Google's suggestions are somewhat useful.
This feature is not limited to chemistry, it also works for other topics. Here's a different query: [tour eiffel design], which shows other "towers of the world" and "tourist attractions in France".
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