Umm...glass is a "solid object" the last time I checked. And no, it's electromagnetic radiation, period -- it's a different wavelength (just like blue is a diff

Umm...glass is a "solid object" the last time I checked. And no, it's electromagnetic radiation, period -- it's a different wavelength (just like blue is a different wavelength than red). Look for the reply from the physicist for greater detail as to why you're completely confused, though. I opted out of the Backscatter X-Ray machines due to what seemed like poor science; the MM wave devices may violate privacy, but that's their worst offense.