Self assembling articles created by scientists in 2012, 1/100th the diameter of a human hair, they spontaneously assemble themselves into structures resembling molecules made from atoms. Illustration courtesy of Yufeng Wang and Yu Wang.
 Previously, scientists had succeeded in building rudimentary structures from colloids. Electron microscope images of “colloidal atoms,” micrometer-sized particles with patches that allow bonding only along particular directions. From left to right: particle with one patch (analogous to a hydrogen atom), two, three, four (analogous to a carbon atom), five, six, and seven patches.
Image courtesy of Vinothan N. Manoharan and David J. Pine.