My science experiment was the vinegar rocket.  First I put vinegar in a bottle.  Next I put the baking soda in the bottle.  Then I shoved the cork in.  Next I shook the bottle  and we waited and waited and suddenly...bam!  The rocket shot up high in the air.  The cork spat out with the tissue.  The vinegar and the baking soda make a gas and build up pressure causing the cork to pop out! 

By Baxta