A good example that shows that air is really "stuff" is the way a parachute works. After doing the activity, think of the problems a parachute would have if air really was just empty nothingness. Work ...
To test your parachute, you will drop it from a certain distance and time its descent. Then you will use the drop height and descent time to calculate the descent rate, which is the amount of time ...
The parachute used by the hijacker known as D.B. Cooper to leap out of a Boeing plane with $200,000 in cash after taking the passengers and crew hostage more than 50 years ago may have been found.