My sister always behaves completely differently than me. I am always shocked at why she behaves differently. We have both been staying together since she was born. Mostly, whatever I eat and drink is the same as hers, and we even studied in the same school. But I discovered many differences between myself and her . when I met one of the twins' sisters. I am curious and want to ask some questions about this. Are they the same? Are they the same in all circumstances? I got an answer of no. Why do people change their behavior? Why do people change over a period of time? Why do relationships change over a period of time? I had always listened that she/he changed now. I found all these answers in the book of peter bevelin seeking wisdom: From Darwin to Munger, The brain changes continually as a result of our experiences. Experiences produce physical changes in the brain either through new neural connections or through the generation of new neurons...