Joe Biden just announced to the world on NBC the intention of the US to wage clandestine cyber war against Russia. The Russians have responded today, 10/15/16, that they would prepare for such an attack. How is this clandestine when Biden made a public announcement? Just more saber rattling, or has Joe slipped again? Cyber war is about attacking infrastructure such as communications, banking, transportation, and electrical grid, much more than just hacking into emails and facebook pages. If this were to transpire, and since most currency actually exists in digital form, would it be prudent to be holding cash in such a situation? How much cash can you cram into a tinfoil hat?