The German people (even the ones who lived next to Auschwitz) claimed to have no knowledge of what was going on with the Jews, even with smokestacks working 24/7. The power of the human mind to deny the obvious must be some kind of survival trait...a method of preserving sanity in the face of the stupefying...but when you can look at the sky and see the things and go online and look at lab analyses of the stuff going into you lungs after a fly-over, I would think it'd make you more insane if you ignored it. Getting angry and venting would be in order at that point, not ignoring. And I find it hard to believe each and every one of you hasn't seen these trails. It may not have struck you as odd at the time, but it should now...since you read and commented on this thread. So the denial is curious. Survival instinct? 'Crab' made a reasoned argument, then he/she blows any credibility by saying ALL the thousands of photos are doctored. And he/she claims to be an expert on topic because of hang-gliding experience. A hang-glider claiming expertise on contrails. Pretty desperate attempt to discredit. Insanity, or vested interest?