The one major change I noted was here on the face of El Capitan. To see it, first click on "original" at the bottom of the photo to enlarge it. Next, look for a line of lighter rock beginning about midway up the right hand face. This line runs up and to the left to a large overhanging block with a dark shadow beneath it. Now look down and slightly to the right. You'll see a tiny square orange dot. That's a Porta-Potty! No, I DON'T have any answers to your next questions. Sorry...