Experiments with smoke inside a plexiglass box challenge convectional wisdom. Smoke can unexpectedly act heavier than air and then spontaneously reverse.
A report in pdf format describes how ellipsoidal water wave motion can be transformed into translatory motion to exchange polluted water in an almost closed sea bay.
An investigation into aerodynamic vibration excitation systems for in-flight flutter testing of general aviation aircraft. Richard R. Western, Melbourne, 1999.
