Answer: What are those light patches on the ground?
You'd think this is easy.. . But in fact, answering a simple question like "What are those light patches on the ground?" turns out to open up a huge can of worms. I spent waaaay too long on this (but had a lot of fun in the process). As you remember, on a recent flight back to San Francisco, I was traveling northward over Santa Cruz and noticed several distinct light patches on the earth below. Here's a map of the light patches I saw. (I actually noticed a bunch, but let's start with just these. Once we figure out how to identify such features, you can go back to the original map and start identifying other features that YOU notice when flying.) So... 1. What ARE those light patches on the ground? 2. Is there any reason that they would be in a line like this? What's special about this particular are that would cause light patches like this? To get you started, the patch on the far left of the image is at:...