It’s easy to make it.
A hole is created on a box of corrugated cardboard as show in this photo.
A packing tape is preferred to keep the box rectangle.
Press the box quickly to shoot the air bazooka and check the air bullet.
I can recommend that the target is very light such as paper or so.
Next, fill the box with smoke to observe the air bullet.
You can learn more in this Dr. Denjirou's movie site.
Dr. Denjirou's Air Bazooka
Hope you and your kids enjoy the exam.
