 If they knew it existed and they knew how, if you go way back into like Patanjali with yoga sutras and things of that nature, there were instructions. Patanjali gave instructions in those how to become invisible. The Rosicrucians have manuals how to walk invisible among men. I mean, there are manuals out there and there are people who I think have done the training and can do it. I don't think that that's an impossibility at all.