For source of time's arrow, consult a good dictionary

摘要

Language is infused with words and phrases that instill in human consciousness a direction for the flow of time. Not just past and future, but words like before, after, earlier, next and then, soon and until. If s hard to make sense about much of anything without slipping in words that allude to a temporal order.rnBut the mathematical language used by physicists to describe the interplay of atoms and molecules recognizes no such single time direction. Equations for the laws of motion work equally well whether time advances or reverses - in the microworld, time's arrow has two tips.