deletions | additions       diff --git a/Columnar_containers_Columna_containers_are__.md b/Columnar_containers_Columna_containers_are__.md  index 8662517..606d67b 100644  --- a/Columnar_containers_Columna_containers_are__.md  +++ b/Columnar_containers_Columna_containers_are__.md 
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## Columnar containers  Columna containers are very different than record-oriented containers. We should discuss both. The question is - do those both go in one section, or in two? I think one section on "Data Tables" makes sense. Record-oriented approaches dramatically predate column-stores in "serious" data science. [Dav - I can't figure out how to use chat, which is where this probably belongs. Stefan - chat is temporarily broken; I notified the team and they're working on it.] New text.