Arrow of Time

What is Carroll's argument in Arrow of Time? Why is the origin of the universe relevant to our everyday lives?
         What are the two different aspects of time? Give an example to illustrate each.

Carroll's argument is that sentient beings measure time by repetitions (such as sunshine and seasons), that the macroscopic universe has a forward pointing arrow of time, and that atomic scale of the universe in unaffected by the direction of time. The origin of the universe is relevant to our everyday lives because whether we are conscious of it or not, the forces and physicality of every moment is determined by the mechanisms of space-time. 
One aspect of time is forward pointing, changing time. This is the seemingly natural event of seedlings growing into trees. The other aspect of time is that the motion of time on the microscopic scale is reversible. For example, the motion of atoms can be reversed without affecting the nature of matter.