Time passes, slips away, and never comes back. Everything we do takes place in time. But what is time?  Does it have a beginning and at some point an end? Time too has miniscule units, so miniscule in fact that we will never be able to measure them. According to calculations, these miniscule time units last 10-43 seconds. Once again, as with the question of the beginning of time, our imagination is stretched to the limit. If time "jumps", what happens in the "spaces" it jumps over?

Chain Reaction

A falling stone can hit another stone and it another and so on. Time has a direction. Causes happen before their effects - anything else is beyond our imagination. A glass falls to the ground and breaks. There is no way in which the pieces will fly up from the ground to form the original glass again. The physical size that lies behind it is called entropy. It describes the degree of disorder. Entropy increases for all irreversible, natural processes, and the world becomes macroscopically somewhat more disorderly.