As I was just sitting outside enjoying the sun (at my home, not far from Northolt and Heathrow), a little droplet of light brown liquid no more than 2mm in diameter fell out of the sky and landed on my hand. It didn't look as though it was from a bird, but is something that happens fairly frequently, for example the marks can be seen on cars from time to time. Someone (with no aviation knowledge!) suggested that these droplets are waste released from aircraft - something I find hard to believe. I know it sounds like a ridiculous question, but does anybody have any idea what it is?! And does it have anything to do with the aircraft which fly over all the time?!
Thanks,
Leon (Confused!)
