Since I’ve been reading and studying “How can a person (me) be better”, the underline part of productivity really got me thinking. If the output is one’s creation or contribution and the period of time is one’s life. What should be the input? In productivity hacks, what matter is the input which should be 100% determined and/or influenced by the output (goal) and time.  However, when the productivity is put in an uncertain, unspecific and totally unknown subject like life, how do we define the output and time?