How old were your beans?
Age of the beans is usually what makes them difficult to fully cook. Altitude can do it too. A pressure cooker is a handy way of cooking beans for such conditions of old beans or high altitude.
When you add the salt doesn't affect "digestive" issues. It's more about keeping the beans intact but having a blander center for the late addition of salt. Early salting tends to cause some bean breakage.
The digestive issue is about...
Ebooks are zipped xhtml (epubs at least though they can encapsulate some other formats too). The other formats are similarly tagged text. The text file has been fairly consistent all the years in the computer world. It is fairly trivial to upconvert the format or remain backwards compatbile with the existing format. I'm not too worried about the file obselesence. Convergence into other electronics was obvious from the start, at least to me. But then I've been reading...
It's a bit lengthy, but is the best management article I've read in a long time. Not platitudes and philosophy, but tangible, actionable, buildable, reveiwable.