theories to explain
facts one does not know
an explanation for.
This is how all human
knowledge starts: By some guess that
subsequently is confirmed by induction,
perhaps with some corrections, and remains not refuted, and in the end may be
used to produce technology.
Here is a relevant quotation, from
Chamfort: Ce que j'ai appris je ne le sais
plus; le peu que je sais encore, je l'ai deviné (= What I learned I no
longer know; the little I still know, I guessed). Most supposed human
knowledge consists of guesses that are more
or less well-confirmed.