I've written a little software package that implements all of the common math for calculating recipes and estimating properties. I'd love another developer on it, because right now it's sufficient for my use, but is also optimized for...me... which doesn't really make it great for anyone else. Really,I don't need any technical help, but more eyes would make things less idiosyncratic and insular.
I'd highly recommend his channel to anyone interested in science and fabrication.
Lampworking is the most expensive hobby I have taken up. Also my favorite.
He wrote an instructional book on glassblowing that's pretty good.