Great Article about Past (and long future) of PDF
Most designers and publishers today don't know the early history of PDF and Acrobat, how it almost didn't happen, and how important PDF/A is in the industry. I jus read a fun article here about it:
https://tedium.co/2018/02/27/pdf-file-format-history/
Also note that the amazing Dov Isaacs from Adobe will be presenting two sessions about PDF at PePcon: The Print + ePublishing Conference this year, including one about how to make PDF/A documents from InDesign, and one called "Lies Your Printer Has Told You"

