Machines do not have life, as they are mechanical. Whereas humans are made of flesh and blood; life is not mechanical for us. Humans have feelings and emotions, and they can express these emotions. Machines have no feelings and emotions as of 2015. They perform work as per the details fed into their mechanical brain. Humans can do anything original, and machines cannot as of 2015. Humans have the capability to understand situations, and behave accordingly. On the contrary, machines do not have this capability as of 2015. While humans behave as per their consciousness, machines just perform as they are instructed as of 2015. Humans perform activities per their own intelligence. On the contrare, machines only have an artificial intelligence.