I have a friend that knows that 'contrails' behind jet planes are composed of chemicals the government is spraying on us...Given his other theories I am more inclined to believe that the chemicals are landing on him, but that may also explain these filters compressing into themselves imitating black holes....and it is black in there when they do this if it is diesel oil they are swimming in...Are any of our Chemist forum members involved in mixing these chemicals the government is spraying on us ? I know, Iknow,,you could tell us but then you would have to kill us..... Greg