Translations:The Prior Confusion (SHSBC 611003)/30/en

There could be lots of theories developed about it, but you stand alongside of a river, and then you go find another river, and then you go find another river, and then you go find another river, and you observe all of these rivers, and you find out finally that the common denominator of all rivers was that water was flowing downhill. The points downstream are at less altitude than the points upstream. And we establish the fact, then, that water flows downhill.