Let me tell you one thing……….
This is neither a research by a scientist nor a thesis by a student.
Well, people say love happens at first sight and that can be true or cannot for some instances it is disproved but for many instances it’s true fact.
And there may be a scientific reason for this too, when a boy see’s a girl or vice-versa , ‘there may be some kind of IMPEDANCE MATCHING between their eyes or brains(still in dilemma that what is that thing that may matches their impedance)’. And that can be cause of first love or just love.