THE LUNGS
Materials:
-A bottle of plastic
-Scissors or knife
-Y-tubes
-String
-Pair of lates gloves
-Rubber band
Instructions:
-First, cut the bottle in the middle.
-Later, put at the ends of the Y-tubes two glove fingers.
-In the bottom of the bottle, put que palm glove with a rubber band.
Now, try to push up and pull down on the latex on the bottom of the bottle.