Well, when you're off to work, under the road or under the buildings that you see, there might very well be cellular concrete, which is a very light kind of concrete that's actually got proteins from bones inside and it's also fully reusable.
Ei bine, când pleci la muncă, sub drumul sau sub clădirile pe care le vezi, s-ar putea foarte bine să fie beton poros, care e un tip foarte uşor de beton care are de fapt proteine din oase înăuntru, şi e şi complet reutilizabil.