A sad day indeed. One of his TED talks changed my career forever:
https://www.ted.com/talks/hans_rosling_shows_the_best_stats_...
https://www.ted.com/talks/hans_rosling_shows_the_best_stats_...
I only waved hello to him, but was very lucky to spend time with the Gapminder/Trendalyzer folks in B41 (his son Ola, Anna and Henrik), before they moved back to Stockholm. My thoughts go out to Ola and Anna. :-(
The way data is presented means if the audience understands it and is interested versus simply saying good job and moving on.