Content-Type: text/shitpost

Subject: Today I learned…
Path: you!your-host!walldrug!epicac!thermostellar-bomb-20!twirlip!am!plovergw!plovervax!shitpost!mjd
Date: 2019-09-01T15:56:24
Newsgroup: rec.food.today-i-learned
Message-ID: <de33ea3ece185aa2@shitpost.plover.com>
Content-Type: text/shitpost

The content of G. Spencer-Brown's Laws of Form (1969) was almost entirely anticipated, almost exactly the same, by Charles Sanders Peirce's existential graphs in the 1880s.

Is there anything that C.S. Peirce didn't invent before everyone else?