The problem of the direction of time arises directly from two contradictory facts. Firstly, the fundamental physical laws are time-reversal invariant; if a cinematographic film were taken of any process describable by means of the aforementioned laws and then played backwards, it would still portray a physically possible process. Secondly, our experience of time, at the macroscopic level, is not time-reversal invariant. Glasses can fall and break, but shards of glass cannot reassemble and fly up onto tables. We have memories of the past, and none of the future. We feel we can't change the past but can influence the future. COUNT 5
QSN1 How many contradictory facts does the problem of the direction of time arise from? ANS1 two QSN2 What kind of physical laws are time-reversal invariant? ANS2 fundamental QSN3 If if a cinematographic film were taken by means of physical  laws and then played backwards, it would still portray what? ANS3 physically possible process QSN4 How is our experience of time at the macro level? ANS4 not time-reversal invariant QSN5 What do we not have memories of? ANS5 the future