Fill a clear glass with 7-Up, Sprite or other carbonated drink.
Drop a handful of candy conversation hearts into the soda.
Watch the hearts dance up and down in the carbonation.
The carbon dioxide picks them up and throws them to the top of the glass. When they reach the top, the bubbles burst and the candy works its way down again.
See more at:
http://www.stevespangler.com/experiment-of-the-week/valentines-day-candy-science-experiments/#sthash.pXpMLo5G.dpuf
