Odd use of a pie chart for a web site devoted to data science, since pie chart portions usually add up to 100%. It would have made sense if they had shown the categories as highest degree earned, instead of degree(s) earned.
Oh god, I'm glad I didn't have coffee in my mouth with some of those. However, there are a few on there that I actually think are pretty good, if unconventional (like the senate voting visualization, which does a great job of showing polarization).