Summary: Proving once again that the Romans were geniuses, scientists have deduced that they knew the secrets of nanotechnology. The Lycurgus Cup appears jade green when lit from in front but glows a red color when lit from behind and had been puzzling historians for years. It was recently discovered that this phenomenon is due to tiny flecks of metal, like the Romans were using nanotechnology to allow different colors shine at different times. It may have even changed color depending on what liquid was inside the cup. Pretty cool use for the technology.
Smithsonian
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