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However, I think people are looking way too much into "stemming". The really powerful stuff is how G is matching words under the same theme. If only the other SE's would play too.
Another thing about the current results is that they recall the blind men touching the elephant and the different impressions they receive. One says it's like a tree, another says it's like a snake, etc.
G is giving results that answer what, where, when, and how. I also see a limitation of answers from one domain.