wavelength, something we can't see anyway. you can't see the beams going around. >> right. >> but when they turn this machine on now, little copper wires going back and forth in diagonals, they can block the microwave signal from getting into the microwave sensor. >> okay. >> now, this is not visible. we can't even show you it disappearing because it doesn't really disappear unless you have microwave visibility. >> what's the point? >> it's the first step. you know, when they put the horse in front of the cart, then they put an engine in the cart and then they made a car. this is just getting the horse in front trying to get wavelengths to disappear. they're only working right now on microwaves, but they're going to get -- >> could it happen? could they get to the point -- >> i think so. >> i'm thinking military will be in on that. >> you got that first one of course. and something if you have a microwave spectrometer and you're trying to look at something and you can make something be invisible, especially in a building or