Almost none of the important stuff. I own most of the books on scientific glassblowing, and they're pretty much all outdated and primarily occupied with information about apparatus design. If you're interested in calculations for distillation columns, designs for multi-stage mercury vapor diffusion pumps, and formulas for silvering glass, the books are great. Otherwise, not so much.

The rest of the knowledge seems to be passed person-to-person, mostly in informal settings. There's a decent program at Salem community college, but it's just too short to become a fully-capable scientific glassblower. That takes about 10 years of full time apprenticeship, which is why the field is dying out.

I've (briefly) studied with some extremely talented glassblowers (Sally Prasch, ...), and I found that helpful, but also most of the learning came from staying up to 1AM trying to replicate something that took them 5 minutes to demonstrate...