Thank you Archus. I am not very trustful of Science when it comes to these matters. I find it hard to believe that my phone or wi fi cause no damage to my body. I think once one has cultivated some awareness of prana / chi / life energy, this is a hard belief to maintain. I wish I could believe it, but I can't!
Does foil block x-rays? If x-rays can go through suitcases and through clothes, I wonder if foil would help? Or is the aluminium or other metals in foil natural blockers?