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* [https://www.facebook.com/groups/y.n.harari/permalink/983222232100989/ Exploring the World of Yuval Noah Harari Facebook group]
* [https://www.facebook.com/InfectiousDiseasesHub/posts/1239454909720335 Infectious Diseases Hub Facebook group]
* [https://www.facebook.com/CleanHandsColombia/posts/167309601617394 Clean Hands Facebook group]
===What the timeline is still missing===
