Toxicological trivia from Octuber 07, 2016: Chemtrail conspiracy theory is an unproven suspicion that long-lasting trails, so-called "chemtrails", are left in the sky by high-flying aircraft and that they consist of chemical or biological agents deliberately sprayed for sinister purposes undisclosed to the general public. Believers in the theory argue that normal contrails dissipate relatively quickly and that contrails that do not dissipate must contain additional substances.These arguments have been dismissed by the scientific community: such trails are normal water-based contrails (condensation trails) that are routinely left by high-flying aircraft under certain atmospheric conditions. Although proponents have attempted to prove that the claimed chemical spraying does take place, their analyses have been flawed or based on misconceptions. In what year we climbed the article entitled: Expert from Rosario discard possible that there are toxic materials in the billowing aircraft:a) 2012; b) 2013;c) 2014.

Correct answer: a. Watch more in Spanish article. Read more in WP.