A famous quote by a 4th century BC Greek philosopher pretty much sums up the lesson here: "You can never step in the same river twice, for you are changed and so it the river." - Heraclitus
Also, Newtons's Fundamental Laws -- action reaction, natural state, equilibrium all have elements here too.
On Apr 18, 2012 David wrote :
Also, Newtons's Fundamental Laws -- action reaction, natural state, equilibrium all have elements here too.