codementum
Lane (first author) here -- happy to take questions on behalf of the co-authors.
xangg already pointed out the nice followup from Matthew Kay and Jeff Heer (https://idl.cs.washington.edu/files/2015-BeyondWebersLaw-Inf...). I'll also direct folks to Ron Rensink's original paper and his several followup papers targeting the underlying mechanisms of correlation perception (https://scholar.google.com/citations?hl=en&user=s_5xXxQXpU0C...)
Meet allows you (the requester) to set the times available for meeting and send a signup page to a single respondent.
It's not about group meetings, or about "office hours" that anyone can sign up for. The use case is surprisingly broad: a small window of availability for a single meeting.
Hopefully it will encourage developers beyond js to create usable, composable modules. (LaTeX comes to mind...)
However, in part-to-whole relationship tasks, pie charts can outperform bar charts, since in bar charts there is no true "whole".
(In addition to Few's post, Kosara has more on this: http://eagereyes.org/criticism/in-defense-of-pie-charts)