A quick funny story...
You know of the eggshell that we are dissolving with vinegar in the little glass- it was in the middle of the kitchen table.
I moved it over near the window, to get better light, so I could take a picture of the progress - colored shell residue is already floating up top.
Maddie wanted a drink, so I got her a glass with some water.
Trev peeks into the water glass, and says (rather nonchalantly) "Hey, the egg disappeared." Just as if that were the aim of the experiment.
"Uh, no Babe," smiling on the inside, " I moved it by the window."