I made an interactive version of the above, with always up-to-date data, TagOverflow.
You can check tag grouping - i.e. for the sake of eliminating synonyms or poorly-defined tags.
Code and a more detailed description is on Github.
I notice that there are some members - especially those with very high 'scores' - who have 50x as many answers as questions.
Perhaps those members, who clearly know a lot, could be encouraged to ask questions for which they already know the answers. After all SE sites allow you to answer your own question.
Also, in case anyone feels it is being arrogant to ...
I do see a lot of people from math and computer science but perhaps that is just the people who are posting. Are there others who come but do not post?
It would help if we could track users by their discipline. I think adding something about their discipline to users' profiles would help us to know who is really here and who is posting. Once we know we don'...