f990dc30_ion__and_Energy__Build_a_Blimp__Explain
[Steps] Students turn the Mylar balloons upside down and tape them to a straw so that one balloon sits behind the other. Students may use other methods of connecting balloons such as rolled up paper or skewers. [Explain] 
Turn the Mylar balloons upside down and tape them to a straw so that one balloon sits behind the other. Make sure the straw is taped securely to both balloons. This creates a frame for the blimp.
Force, Motion, and Energy: Build a Blimp
Explain