How the Romans invented Nano-Technology.

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What if I told you that the Romans invented nano-technology? Well, the Lycurgus Cup proves that the Romans were capable of things that modern researchers had thought impossible. This remarkable cup dates from the late roman empire, from the late 4th century AD, so an era where we would think that feats of advanced technology were not possible any more due to the empire's decline. The cup is special, because it is made of a type of glass, that appears green in reflected light, but red in transmitted light. To achieve that, the romans extracted extremely small gold and silver nanoparticles of only around 70 nanometers in size, and mixed these nanoparticles with the glass. It is completely unknown how exactly they extracted such small particles, that can only be seen with an electron microscope, from gold and silver. Now to be fair, they probably didn't understand the principles of nanotechnology and light refraction on such small scales, but they did understand that they were extracting something very small, which would have an effect on the colors of reflected and transmitted light. So with intention or not, the Romans actually built the first device that employed principles of nano-technology, unbelievable but true.