The Universe Is Not Locally Real

[Mister Agenda]

My C in Calculus does not bode well for taking on QM at a deeper level. I'm 60 though, will qualify for free classes soon and I'm planning to retire in a couple of years. I've got a good layman's grasp of evolutionary biology, I might go deeper into that. Or take stuff relevant to financial planning so my retirement goes smoother (better late than never).

As far as graduate school goes, crappy grades are not necessarily a showstopper; you can always take the GRE, both general and subject tests in physics and mathematics, and prove yourself there.  If an admissions committee would inquire further, you can make-up whatever excuse suits the moment to explain away your undergraduate record.  Really good graduate schools will also test their potential candidates with written and oral exams, yet another opportunity to prove one's self.

Yah, the professor was in his eighties and hard of hearing. I think I could have done better with an instructor who answered the questions I asked instead of the ones he heard. Maybe I'll re-take Calculus and see if I can do better...hopefully my 60-year old brain is still capable.