Yesterday, I posted to Twitter an interactive map using the classic John Snow Cholera dataset and tiles made from Snow’s map, which attracted a fair share of interest.

Interactive Snow cholera map w/@LeafletJS, #rstats, @rstudio: http://t.co/vKYnx6lSxT Thx @lincolnmullen @abresler pic.twitter.com/1zkq7UiyKr

— Kyle Walker (@kyle_e_walker) March 9, 2015