A company in China reportedly used 3-D printers to make 10 houses in a day . Karen Kohn : 3-D printers have helped to address problems like hunger , poverty . She says scientists are even experimenting with printing human tissues , too . Others : Millions worldwide can benefit from 3-D printing houses or foods .
A company in China reportedly used 3-D printers to make 10 houses in a day . Sally Kohn : 3-D printers have potential to address problems like hunger , pollution . She says scientists are even experimenting with printing human tissues , organs . Kohn : Millions worldwide can benefit from 3-D printed houses or foods .