Mathematics
--- https://youtu.be/OmJ-4B-mS-Y
if you think mathematics is all about numbers, you probably think Shakespeare is all about words and music all about notes --- Cliff Stoll --- https://youtu.be/AAsICMPwGPY?t=0
mathematics is about making stuff up and seeing what happens --- Vi Hart, supposedly. see invent and discover and axiom
resource pedagogy and rigor in mathematics, talk by Grant Sanderson --- https://youtu.be/UOuxo6SA8Uc
see