Yeah, SPF, DKIM and DMARC are incomprehensible. The only people with the time, motivation and expertise to understand and apply them, are professional spammers. Most of the legitimate email I get, fail one or more of these tests.
If I recall, SPF limits the number of domains you can enumerate in your DNS records.
I write a genealogy app (family history). Recursion is the foundation of the code, and permeates everywhere. The call stack can go 200 deep or more (~4,000 yrs). The code has been successfully running on millions of desktops for thirty years, and has never caused a crash or infinite loop because of recursion.
The secret is to check at every step that there is no "he's his own grandpa" loops in the user's tree, where (s)he inadvertently makes one of a person's descendants, also his ancestor. This happens sometimes because re-using the same names can cause confusion.
This is about the root of humanity’s problem: the inability to avoid misusing knowledge and technology.
All our inventions are but improved means to an unimproved end (Thoreau)
The car should have an option to stop, let the passenger & baggage out, then resume its search for a parking spot. Or leave altogether since it no longer needs to be in the airport parking lot.
There were real bugs and there was a real possibility of major disruption. We were spared because of mobilization of resources and the dedication of the programmers involved.
I'm working on a project to 3D-print tablets of text, press them onto clay slabs, and fire the latter in a kiln. Should preserve the information, such as biographies, for as long as Babylonian tablets.
I did this for a while. I found a roll of heavy-duty aluminum foil (not quite pie-plate thick), and scavenged some old dot-matrix printers. Removing the ribbon, I printed text and low-res images on the foil. I inserted a roll containing my father's biography in the ashes of his funeral urn. Should be readable by archaeologists centuries from now.
