"Angela Krieg, left and Cheri Nielsen, sixth-graders at Frederick Post Elementary, demonstrate their experiment, 'Solid plus liquid equals gas,' Thursday at the schools science fair. In the experiment, Krieg and Neilsen poured backing soda into a bottle partially filled with water ad then covered the bottle top with a balloon. The chemical reaction of the baking soda in teh liquid caused the balloon to inflate." Post Falls Tribune, February 27th, 1992. Photo by Doug Watts.
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