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an automized process that can build an house
like you have those smaller systems that make 3d replica's
you just give in the 3d model of the house and a machine builds it
bags that clean water in a short time
you can say why don't you keep the water clean
humans are know for their 'we'll see later attitude' or 'after 1000 ths of death will wake up' mentality
hopefully the next generation thinks different as they will be now coming to live with the consequences of other generations mistakes and blind believes
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