You may have heard about the Martian crab this summer. If you didn’t, Google it. NASA sent out a photo, as they do regularly, from the Mars Curiosity rover that, if you look at it closely, appears to show a giant crab in an overhang in a rock outcropping on the Red Planet. The image…
![Eye Exam](https://griffethvision.com/wp-content/uploads/2015/11/griffeth1-100x100.jpg)