Today we watched a video about buoyancy. You can make a submarine! You need: a pen cap, a small piece of playdoh or clay, an old two liter bottle filled with water. Put the clay around the tip of the pen cap (be sure the pen cap has no holes in the top) and put it into the bottle of water. It floats! Put the cap onto the two liter bottle and squeeze the bottle to control your submarine. It will rise and fall! Cool!
