Excerpt from the article:<p><i>For the first time ever, scientists have created an invisibility cloak made from silk, and coated in gold.<p>The new metamaterial, as invisibility cloaks and their kin are technically called, only works on relatively long terahertz waves (a region of the electromagnetic spectrum between radio and infrared light)</i>[...]<p>In other words, they haven't "created an invisibility cloak". They have discovered some interesting properties of a new material based on silk.