Salt/Sand....What is the Difference?

A couple of weeks ago, Sterling took the kids to a new park near our house, which had a large volley ball sand pit. As we were leaving, Sterling saw Aubrie head for a pile of white sand she saw on the pavement. She scooped it up into her hands, and Sterling didn't see it again until about half an hour later when they finally arrived home, and she was up on a stool in the kitchen with the lid off the salt shaker, just about to pour it in. Good thing he was there to prohibit that little act of supposed brilliance.