Which of these historical artefacts is now understood to owe its properties to u

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1. Which of these historical artefacts is now understood to owe its properties to unintentional nanotechnology?

The ancient Roman Lycurgus Cup, which changes colour depending on lighting

Medieval stained glass windows, coloured using nanoparticles

Damascus steel swords, containing carbon nanotube structures

All of the above

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All three are genuine historical examples — nanoparticles gave the Lycurgus Cup and stained glass their striking colours, while nanotube structures gave Damascus steel swords their legendary strength.