science,

during room 10 science, we all did a rocket what we did we used 3 pencil and baking soda and vinegar

it was fun because we all did made one that would fly up mahoney shacked one and it exploded on him
we put the 3 pencils on the side of the bottle and 

put the duck tape around it then we got backing soda in a paper tell  then we rolled it and put vinegar then we put a rubber lid on it