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these would be good for _group_ discussions (synchronous) e.g. - `filter(mtcars$cyl == 8)` - `c("red," “yellow," "blue")` - `ggplot(mydata, aes(x = Time, y = Conc, color = "red")) + geom_line()`

https://github.com/IQSS/prefresher/blob/master/01_warmup.Rmd

instead of this stock image: https://github.com/IQSS/prefresher/blob/acbdb980273469684c191c1218fdb2b4d50239a2/05_optimization.Rmd#L561

for beginners, some symbols may seem the same but have vastly different implications in code. It could be good to drill it in rather than try to explain it on...

These ready-made gifs provided at https://github.com/gadenbuie/tidyexplain look great: we can put some in the chapter on merges and joins, replacing the current infographic. ![left-join-extra](https://user-images.githubusercontent.com/8290417/52815742-75f3ef00-306d-11e9-8197-d9c786503862.gif)

MID only starts 1810s, whereas polity starts earlier. Cut off polity or explicitly discuss this fix in memo.

you can have private repos on free gh?