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Hi --
Here's another riddle that you may find entertaining and/or
pedagogically useful.
Short version: At the most basic physics level, what makes a
turbojet engine go the right way? ...
Now, to a first approximation the primary effect of the flame
is to increase the temperature and pressure of the gas in the
guts of the engine.
So the big question is, why does this high-pressure gas decide
to go out the back rather than going out the front? ...