shells
![Looking at an opal through a scanning electron microscope](https://nisenet.org/sites/default/files/styles/curated_list_large_cropped/public/images/catalog/8369/opal_sem_small_size.jpg?h=e39eea65&itok=5jTuJe0x)
Colors at the Nanoscale: Butterflies, Beetles and Opals
In this activity, learners will be exposed to the term ‘Photonic Crystals,' explore some of the well-known photonic crystals in nature and will also be able observe one method that scientists use in trying to replicate this process.
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![a collection of shells of different types](https://nisenet.org/sites/default/files/styles/curated_list_large_cropped/public/images/catalog/10752/img_0785_cropped.jpg?h=d770550b&itok=lSBck56O)
Why are Seashells so Strong?
In this activity, learners explore seashells and various structural models to discover that seashells are a composite material made of both inorganic and organic materials.
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