Williams used a device that allowed her to scan each atom and change their position to form the iconic shape. The world's smallest Christmas tree stands four nanometers tall, which is the size of a DNA strand. The end result was a tiny green Christmas tree that is roughly the size of a DNA strand. Just this past October, a team from Leiden University unveiled a 3D printed boat about the third the thickness of a human hair. Just this past October, a team from Leiden University unveiled a 3D printed boat about the third the thickness of a human hairResearchers created a range of other objects as part of the process of testing their 3D printed techique.

Source: The Nation December 22, 2020 18:56 UTC