Beetle bling: Researchers discover optical secrets of 'metallic' beetles

Costa Rica was once regarded as the poorest of all the colonies of the Spanish Empire, sadly deficient in the silver and gold so coveted by conquistadors. As it turns out, all of the glittering gold and silver those explorers could have ever wanted was there all along, in the country's tropical rainforests—but in the form of two gloriously lustrous species of beetle.

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