By Sara Morris Swetcharnik
A father and son were strolling through the Reptile Discovery Center at the National Zoological Park in Washington, DC. They stopped in front of the exhibit titled "Glass Lizard." The glass lizard, a shy, shiny creature that normally hides underground, was nowhere to be seen. The child was overheard asking his father, "Where is it? I don't see anything." The father told his son that they were both probably looking right though the lizard, and couldn't see it because it was transparent.