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No, they were already made. I meant to ask what he used to make them, but I never had the chance.

I draw my slides in Xournal on slide sized pages, and then export to PDF to present them. I roll a few patches to the software to make it easier to make build slides, but otherwise it's pretty self-explanatory. (https://github.com/ezyang/xournal) I do the same thing for diagrams too. (http://blog.ezyang.com/2010/04/diagramming-in-xournal-and-gi...)