There are those times when you get done early and have 10 minutes to kill before the next activity.  All you'll need to do is raid the scrap paper box and hand a pair sciossors to each kid.  Three cuts, five folds and you can make these cool helicopters in about 2 minutes (add 20 minutes if you teach kindergarten or first grade).  Not pickin' on anybody, i'm just sayin'…

    This is a great lab that is really easy to do.  It is a great 5 minute time killer at the end of a class period, excellent brain tickler if you want to throw the kids a puzzle at the end of the year or, if you are really teaching flight and fluid dynamics, is a great lab for that too. It hinges on Bernoulli's Law: The faster a fluid (air) travels across a surface, the less pressure (downward force) that fluid (air) exerts on the surface.  It is the idea that explains lift for birds and planes.