Extrusion - art or science?

摘要

WATER flows in river beds from the mountains to the sea,from a upper level to a lower one,because of the law of physics.Thus,we have to accept this reality.Despite all efforts,there is no way to force the flow upstream.The same applies to those who "create" the perpetual motion:as soon as they claim it,they reveal their ignorance about laws of physics or their disbelief of these laws.I have not written these concepts before because I did not feel "courageous" enough.I was figuring my colleagues laughing at an article stressing the obvious fact that laws of physics do exist and that they cannot change,and therefore we have to consider that events occur in accordance to these laws in a precise and unalterable way.