There is always a fine line between giving too much info and not enough needed to have your questions answered but to make a long story short, my 8 year old loves math and all that it applies to. For an 8 year old he's pretty good at math so I've been inserting sort of high level implications of advanced math so he knows where he needs to go with his understanding. And, sorry for all the prelim info but Cosmology just happens to come up all the time. I've been explaining to him in very lamens terms (very) my understanding of the shape of the universe based on (lurking around here) what I've read and found: http://www.hypersphere.com/hs/abouths.html I don't think they are selling these anymore but what I'm fishing here for are suggestions on how to steer my son towards advanced math, and eventually Cosmology if that's what he's into. Educational materials good links etc. Just to add they get a little South of science in that link but was the model OK for a meager representation of a 3d hypersphere (shadow) nested in 4d space? That's pretty much all I got from that link, there was some magery in there and that has nothing to do with math. Thanks for all your help.