Cloak

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he cloaks have open spots in their centers in which to place items up to 5.5 inches wide (14 cm). They are designed to "makes a small object placed in its hollow center invisible to frequencies from 9.7 to 10.1 GHz (close to the range used by radar speed guns)." according to Popsci. And when microwaves are beamed at those objects from the side, the cloaks make it look as if the items are not there. So far these cloaks hide objects only when viewed from the side. To make cloaks that render objects invisible to beams coming from any direction would involve gluing together several cloaks to form a larger structure that completely encloses an object, said Urzhumov. Theoretically, the technique can be used to create much larger devices which could have many military and civilian applications.