We hate to be the ones to tell you this, but not everything about your Vegas vacation stayed in Vegas. iPhoto’s Info button can show your pictures’ resolutions, shutter speeds, and so on -- but it can also reveal more private stuff, like the location of your hotel room and the time an image was captured. That’s metadata, and there’s plenty to explore inside every photo on your Mac. To see it all, you’ll need a metadata reader like iExifer. Apple’s Preview can do the job for free, but iExifer’s interface tweaks make it worth a look when looking into your pics.