Geodesic domes are some of the strongest structures ever, and a very good start for understanding some of the basics and some of the fancy of engineering, and of science, math, technology…
plus, they are quite fun and really useful.
I have been working on a 19-foot geodesic dome, as a proof of concept of a habitable structure built with STEMginery parts. All the parts, believe it or not, fit inside the a Priority Mail Flat Rate box. $15 to ship a 19-foot structure anywhere in the States!
Here I am enjoying making a smallish one, just 6 feet wide.