Not the buildings, they have little faith in the structural strength of poured concrete which is why they use rebar. It increases the strength to tolerable leve

Not the buildings, they have little faith in the structural strength of poured concrete which is why they use rebar. It increases the strength to tolerable levels so they can build what they want to build. So yeah. Civil engineers know the properties of the materials they work with. So should hardware engineers. I'm aware they all have metal frames. I'm also aware that some aluminum laptops incorporate the frame into the lattice structure the motherboard sits on. I like when engineers find ways of using the materials to their strengths (aluminum laptop) vs having to strengthen (plastic) or support (carbon fiber).