Awestruck

"What's this?" Angie asked, holding out a shiny silver disc in the palm of her hand.  I sighed, identifying it as a lithium battery from the two-pack I had bought to replace the depleted one in the remote control.  "I don't know why those things keep floating around the house," I said in exasperation, counting silently the number of times I had stowed them on my desk.  But Angie stood in awe, eyes wider than saucers.  "They float!?!"