When I was in the car with my dad today, he shared a RadioLab podcast with me that indirectly talks about the history of AAC. It's called Bliss and is currently free on iTunes.
It's about Charles Bliss and a Symbol language he invented. It was largely ignored until a nurse in Canada started using it with her patients who had cerebral palsy and couldn't speak. Bliss didn't like how they were changing his language and his lawsuits are why only a few use the symbols today.
The part about the symbol language is on the first half of the postcast and is worth a listen.
I've got three new sports theme sets up in my TPT store. Check them out and I'll have a nice long post with pictures soon!