Swedish researchers have developed a way to 3D print nanoscale shapes made entirely of a single strand of DNA. They developed a computer algorithm that can create 3D shapes using long strands of DNA that can be held firmly in shape with smaller strands of DNA that staples the shape together. Nanoscale constructs can be used to develop microscopic machines that can deliver life saving medications or even reprogram cancer cells. You can find out more about the process over on 3DPrint.com.