Arrow of time determined by life´s easier direction for computation

By reading Evolving Time´s arrow  I remembered some old slides exposing my thoughs about the question. that I had unpublished. It is a bit technical but the examples and most of the explanations are made to be clear to interested people. ¿Can a ninja jump back to the top of a three-floor building?. Yes but....
If you do not understand something, go along. Feedback of any type are welcome. Here are:

https://docs.google.com/present/view?id=dd5rm7qq_142d8djhvc8