While this is a great science experiment, Ruby likes it for the calming effects of watching the oil bubbles. If you don’t have Alkaseltzer, try this alternative recipe in a small vessel to save oil: 4/5 oil, 1/5 white vinegar (instead of water), 1 teaspoon of baking soda (all measures are approximate). Imagine your feelings are bubbling up….and then calming down, as you take deep belly-breaths.