Otherwise, the only problem (despite the fact that no Chinese sweatshop kids have hands small enough to assemble them) is that right now this thing requires something called a scanning tunneling microscope to operate, which is a device that most people don't have readily on hand. The atoms also have to be kept incredibly cold, or else it opens up a rift in the space-time continuum or something.
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Keeping things cold to avert disaster is a field we have some experience in.
Either way, the experiment shows that data can be stored at a size way, way smaller than science once thought possible, so maybe we're not far from a smartphone so tiny that you could lose it forever with a hard sneeze.