The Romans may have first come across the colorful ... They’d impregnated the glass with particles of silver and gold, ground down until they were as small as 50 nanometers in diameter, less ...
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What is Three Kings Day? Here's what to know about the holidayThe holiday, which is celebrated on Jan. 6, commemorates the Three Wise Men who, according to the Bible, brought gifts of gold, frankincense ... Christmas season for Roman Catholics.
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