dan simmons has been to see some unusual buildings, and the robots and very old wisdom used to build recently opened its doors. it has been partially built by robots, and the lack of any tea breaks isn't the only cost saving. this flexible mesh mould allows for fast, creative design. the bots build the wall from digital models. these 1—offs would typically mean more materials are wasted than standard straight walls. but doing things this way results in hardly any material waste. elsewhere, these dynamic casting machines create both load—bearing functional supports and lighter facades, while 3d sand printers produce ultralight ceiling slabs. again, all with minimal waste. and that's important. because you may be surprised to learn that we are just a decade or two away from running out of materials to build with. we are rapidly running out of resources. as funny as it may sound, we are even running out of sand to make concrete. this particular floor actually is printed out of sand, but other materials could be compressed dirt, basicallyjust dirt locally found on site, or clay, or a com

simmons' family with nono. >> there he is. >> i'm marie, dan's sister. and i'm pleased to meet you, mr. >> i'm doris, i'm don's oldest sister. >> i'm eleanor simmons, i was >>'meresion i donald's brother, only one left. and pleased to meet you. and this is quite a surprise. >> reporter: they brought the photograph of their loved one that they have cherished for 75 years. >> see him there? >> yeah, definitely. >> that's him. >> yeah, that's him. >> reporter: they had so many questions. >> did you meet my brother donald in training or over in england? >> oh, from the day he was inducted, we were together all the way through it. maybe we can get some close sure here, you know? >> it would be nice. >> reporter: nono already talking about a trip to syracuse to see them. >> just meeting you, we feel like we love you already. >> oh, yes, definitely. definitely. >> nono and his new friends, that family from syracuse new york and their shaved loshg for a fallen hero. i'm david muir. i'll see you tomorrow. good night. >>> now news to build a better bay area. >> the heat is taking its toll on the f