Rachel Writes by R.A. Garber A couple of days ago, I listened to a friend expounding on the dangers of LED lighting in almost apocalyptic tones. I asked where they’d read about it. “Oh, everywhere!” I could feel my antennae rise, the feelers that suggest their “everywhere” sources were in the “nowhere” of social media. The thing about social media (I’m avoiding the F-word) is that a factoid can make the rounds again and again until the reader ca…