DragonflyTV . Podcast - Wind Tunnel | PBS KIDS GO!

Source : http://pbskids.org/dragonflytv/show/windtunnel.html...

I love auto racing. One thing I've learned about the sport is that most race cars are tested in wind tunnels, so I made one for my science fair project! Then I put a bunch of my car models in it to see how aerodynamic they were. My question: Which vehicle shape is the most aerodynamic?