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Nice analysis. I thought the "gauze bandage" explanation seemed a bit iffy. As for the metals analysis on Intellihub, a more truthful headline would have been LAB TEST CONFIRMS MYSTERY FIBRES ARE 99.9% ALUMINIUM-FREE :)

Hi @ignorancewasbliss. The GM corn study was badly designed (some would say deliberately so, given that the author was trying to sell a film and a book about his shock results!) and the paper was later retracted. Other studies have not replicated the results...

That led me to search for "contrails on stamps" and came up with this from 1968, marking the launch of Concorde. http://colnect.com/en/stamps/stamp/327244-Underside_of_a_Concorde_with_contrails-British-French_Aircraft_Project_Concorde-Vanuatu Not sure how persistent these are though :)

Nobody is trying to deny that you are seeing contrails followed by a thunderstorm. That is not in dispute. All that we are disputing is the order of cause and effect. To borrow an analogy I saw recently, it is like seeing a flock of birds flying over and a shadow passing across the ground, and...

I know this is a very old comment, but has it perhaps occurred to you that the lack of freedom and tolerance in Saudi Arabia is exactly the answer to your question:

Are you sure you have the right numbers there, @Ross Marsden? 300 hPa is not close to 36,000 ft.

Here is a nice time lapse video showing how the contrails are associated with - but are not the cause of - the cirrus ahead of an approaching front. Notice how much higher the contrails are than the altocumulus that moves in as the front approaches at the end of the video. They are not...

The contrails do not cause the thunderstorm. They are a symptom, not a cause. They are simply a sign of the air becoming moist and unstable ahead of a weather front. This has been known for half a century or more. Here is a link to an article in Skiing Magazine from 1968, which talks about how...

Again, you have a major misconception. Nobody is deliberately making more contrails. In fact scientists would like to DECREASE the amount of persistent contrails, because they increase the global warming effect, which "solar radiation management" would try to decrease. Solar radiation...

You are making a huge (and incorrect) leap from "jet contrails increase cloud cover" (which they do) to talking about "nano particles" and geoengineering. How could a "chemtrail" that wasn't made of water spread out and form a cirrus cloud? It couldn't - it would be impossible. The very fact...

Spreading contrails are effectively identical to cirrus clouds: the water from the aircraft exhaust is only a tiny fraction (maybe 0.01%) of the total water in a "mature" contrail. This study by Gaby Rädel and Keith Shine at Reading University (UK) tries to put figures on the additional cloud...

Oh, yeah. That's pretty cool. The refractive index of air varies according to temperature, pressure and water vapour content. I'm not sure which would be the dominant factor here though... Edit: Mick beat me to the post. Probably pressure, then?

I think that is the vortex being spread outwards as it interacts with the ground?

A couple I came across on Flickr: Graz, Austria, November 1985...

Hope this is OK to post here - it's quite a new video and one I hadn't seen before - a really good compilation of low-altitude vortices and aerodynamic contrails on take-off and landing. Look at 5:12 for a nice propeller contrail from a Flybe Dash 8 :)

For some reason, yesterday I was reminded of an old British cartoon from the 1980s called Jimbo and the Jet Set, about a talking aeroplane. I looked up the opening titles on YouTube, and they're pretty funny. Notice at 0:15 how the SHEEP are being sprayed by a "CONTRAIL" but simply carry on...

Well, to be fair to the chemtrail believers, they are using the term "geoengineering" in the sense of climate engineering, specifically solar radiation management. However they conspicuously fail to explain how solar radiation management (spraying aerosols into the stratosphere from modified...

This could go in the "debunking humour" thread, but it's also factual.

Certainly looks like an effect on the lens. You can see the characteristic ring-shaped interference patterns caused by constructive and destructive interference of light waves. Similar to http://en.wikipedia.org/wiki/Newton's_rings

I don't think I've seen any pics of this aircraft doing the rounds on the chemsites yet. They're still heavily pushing the Boeing 747-8 at Paris in 2011 though!