Metamaterials are a mind-bending class of matter. Broadly defined as manmade materials with unusual properties not found in nature, this category of materials is probably most famous for serving as the building blocks for a Harry Potter-style invisibility cloak. But so much more is possible.
One thing that all metamaterials have in common is the ability to make waves behave strangely. This can lead to electromagnetic waves zigging when they should zag and sound waves curving in ways they don't normally do. The list is almost limitless, but we've put together a few of the exciting uses for metamaterials that are just over the horizon. [Nature]
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