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No they are not. They are designed to make water precipitate out of the clouds and fall as rain. This will reduce the amount of water present in the cloud and would therefore tend to make the cloud smaller. This is why cloud seeding has been used to attempt to "clear the air" for parades etc in...

Yes, in fact the trails are more dense the closer they are to the nozzles, as you would expect.

Perhaps better to write them as 14,000,000,000,000 versus 50,000,000,000,000,000,000. Or, converting to TeV to make the numbers more manageable, the LHC particles have an energy of 14 TeV, whereas the particles from the sundeep space (edit: see below) have an energy of 50 million TeV.

Especially as the building was demolished before MH370 disappeared. If you're trying to hide a large airliner, I'd say a freshly bulldozed smooth rectangle of dirt is a pretty useless place to do it.

As far as I can ascertain, the "microwave ovens were banned in Russia" myth is just that, a myth. Some discussion here: http://skeptics.stackexchange.com/questions/17126/did-the-soviet-union-ban-microwave-ovens-in-1976 BTW I've always used the microwave to warm up infant milk when needed (the...

A nice illustration this morning of how thin the layer of air that will form contrails can be. This plane flew almost overhead, suddenly leaving a thick trail lit up by the sunrise, which stopped just as quickly. Another plane with a short non-persistent trail crossed behind it: The one...

You "found on your camera" a NASA image from 1974? Wow.

Yes it's the same with iOS. The compass calibration can be a bit off but usually it is close enough to give you a good idea. I just wish there was an option to turn on filters on the augmented reality view as well. The view can get very cluttered around here.

Wish I had a better camera in my office today. This was a sunset that was definitely enhanced by contrails. (Also a few reflections of the lights which are almost impossible to avoid in this building.) The two trails towards the right separated out into little "smoke puff" clouds. Then a few...

Summer Lake: http://en.wikipedia.org/wiki/Summer_Lake_%28Oregon%29 Easy to see why this could lead to "milky looking" rain downwind.

Very nice illustration. See also my post from the thread Mick linked to: https://www.metabunk.org/threads/above-or-below-how-to-tell-if-a-contrail-is-above-or-below-a-cloud-layer.4334/#post-130090 That plane is higher than the contrail it is crossing, i.e. passing behind it. But it looks as...

There certainly are lists like that doing the rounds on Facebook, yes.

Yes, right back to old "smoke screen" videos from the first world war! It can become a never-ending battle.

This is what I'm picturing, in a simplified "cross-section" view (showing only the trails from the inboard engines). The trails are flattened and slanted upwards and inwards, so you are seeing the one on the far side "side on" and the one on the near side "edge on". The effect is caused by...

I've seen this effect on other A380 pics: the inboard starboard engine seems to produce a thicker (or sometimes double) trail. I assume it is to do with the angle we are viewing it rather than an actual difference in the trail thickness? I think it must just be the viewing angle as this pic...

Yes, exactly. Real-world example: I know a property PR who got some very good press about a high-end apartment where the buyer would get the wine cellar fully stocked with bottles picked by a top wine merchant. However in reality, even though they *could* do that, he admitted that the cost is...

Neither, or rather both, to a degree, in my opinion. I work in the media, and used to work on the travel section of a newspaper. That's how a lot of PR works — come up with a wacky proposal that is technically feasible but probably not practical, eg "You could book our entire hotel for the...

But there is no false advertising involved, as far as I can see. If somebody wanted to pay the extortionate price then I am sure the cloud seeding could be arranged. £100,000 would surely cover a small-scale operation? Cloud-seeding is carried out in France: they do "hail suppression" to prevent...

Congratulations on a very successful PR stunt @JonC! I saw this story picked up by several UK papers. Not to mention photos of the press cuttings used on more than one chemtrails site! Unfortunately (or fortunately, if you're in the PR business) a lot of papers seem to be suckers for this sort...

Where and when exactly was this taken @Joe? Wondering if it was at all related to this: http://www.reddit.com/r/aviation/comments/2v2gqb/crazy_square_cloud_i_saw_today/ Crazy square cloud I saw today (i.imgur.com) submitted 07 Feb 2015 by Airspeed12