Despite what many of your conspiracy theorist friends managed to tweet and Facebook from under their tinfoil caps yesterday, those streaks across the sky last yesterday were not, in fact, some kind of secret government plot to spray the Bay Area with deadly chemicals. Or maybe that's just what the government wants you to think. ABC7 investigates:

In conclusion: the government is not trying to eradicate San Francisco via chemical warfare. Instead: this lovely and crisp fall weather we're having caused normal condensation clouds to form behind the jet engines of regular air traffic that crosses our skies every day. A little extra humidity and a complete lack of fog caused those clouds to stick around long enough to alarm many an Instagrammer.

Now, the real question here is what mysterious forces are keeping newsman Dan Ashley's hair rooted to his scalp?

[ABC7]