I was started my research only with one thinking "How we feel and understand sadness or happiness of others, why our eyes sometime filled with tears, when we see others crying or sad, why we cheer up when we see others happy, why we bless others, why we care for others, why we become sad when we watch sad seen in movies, why we motivate when we watch something exciting and meaningful in movies, why, why and why??" these are the big questions front of us. My common answer which support to all these questions is "when situation is common between two or more than two people they completely understand each other, because their brains neurons handling same situation. Some time may be feelings for other because of past common situation of us is the present situation of someone or may be sometime we think if that situation on me what I would do. Hence common situation either good or bad doesn't matter but common situation people show strong feelings about each other with respecting emotions and feelings of each others and this is because "common situation setup brain-to-brain link between people through which they understand feelings and emotions of each other".