hey don’t teach MAGNETOBIOLOGY in the U.S. The Beast does not want YOU to know what wifi/cell towers etc. are doing to you. Don’t spend your money on $20 a foot silver fabric. Buy confetti dot metallic fabric from Joanne’s online $5 a YARD 45′ width and double it. It blocks emf pretty well actually it reflects it. How do I know? I am seamstress with a meter. I tested all my metallic fabrics. I also made my own screens for the router with metal screen and a metal w/holes waste basket from amazon. I capped off the basket with silver fabric, and a tie to wrap all the wires. Yes I did buy some silver fabric before I discovered the confetti dot works.