Using code and advice from http://www.d3noob.org/2013/01/adding-tooltips-to-d3js-graph.html, I have just added tool tips with the location to Electives World.
It proved to be much easier than I had expected. While thing took about 30 minutes.
It's located here:
http://www.science2therapy.com/d3visualisations/electivesworld_0.2.html
It's not perfect but it's improved.
Next step: use more of the data.
Maybe colour by speciality
Or add speciality to tool tip.
I need to review the data to see what's feasible.
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