EVERYONE has seen the lines that follow planes across the sky, but few people are able to explain what they actually are. Depending on who you listen to, you could be told the truth, or you could even be told a conspiracy theory. However, there's a very simple explanation for the lines and what they are, regardless of what some may believe. Contrails, short for condensation trails, are mostly made of water, in the form of ice crystals. They are formed when the water vapour in aircraft… (www.thesun.co.uk) さらに...
