An exotic form of silicon that can be stuck together and then peeled apart has been developed by German researchers. The material, dubbed "silicon Velcro", could be used to manufacture microprocessors and devices that manipulate fluids on microscopic scales. Researchers at the Technical University of Ilmenau in Germany created the material from "black silicon". This is generated when normal silicon is hit with a powerful laser beam or bombarded with high-energy ions, producing a dense, microscopic array of needle-like structures on its surface. Light bounces around between the needles without escaping to give the material its black appearance. The German...