Also, here's another #colorblindness -friendly palette, this one with 7 colors, from someone with more expertise than me: http://mkweb.bcgsc.ca/colorblind/
@skiant Oh hey thanks! I'd seen those mentioned in the d3.js docs and liked them but didn't know they had the added benefit of cb-friendliness. Extra plus good.
@phoikoi I'm also a big fan of the Viridis color palettes: https://cran.r-project.org/web/packages/viridis/vignettes/intro-to-viridis.html