With my scrap wood I decided to cut some little "volcanoes" for the kids to play with.I thought they might enjoy doing eruptions with vinegar and baking soda. I just cut some 1 1/2" wood at a 45 degree angle and then drilled most of the way down in the center. It was fast and a fun way to use up some scrap wood. We put food coloring in it to make the lava different colors as well. William liked it so much that he cried after we used up all of vinegar and kept asking me for days if we could do it again.
