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Test # 161


1.
Lightning never strikes in the same place ________ .

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    Robotic insects? The jewelry of an ancient Egyptian queen? No, these bugs are the real thing: Two species of gold and silver beetle found in the rainforests of Costa Rica. The reflective shells of Chrysina aurgians (gold) and Chrysina limbata (silver) may help the bugs blend into their damp, forest environment, which is studded with shimmering droplets of water. A new study published in the open access journal Optical Materials Express finds that the beetles shells are made of progressively thinner layers of the exoskeleton material chitin. As light passes back through each layer of chitin, the waves combine to become brighter and more intense, creating the glint of gold and silver. According to study researchers, understanding the beetles beauty may help scientists replicate it creating metallic looking materials out of organic ingredients.


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