So I was having some hardcore act 1 feelings, and I got to thinking about jade. We assume that the kids all went to schools of some sort, but jade lived on a deserted island, leading me to believe she taught herself everything. Did 13 yr old jade actually teach herself nuclear physics and everything else she was into? And on top of that, we know that grandpa Harley was alive and died at some point in the island- did jade perform taxidermy on her dead grandfather's corpse????

Yes, Jade did taxidermy her dead grandpa. Also, she had the internet so she probably just used that to research her interests.