What is the surest sign that two persons have fallen in LOVE ?

If a couple passes the tetsts of flirtation and small talk, the next steo may be love, even though neither may admit or even realize they have fallen in Love at the time. One tell tale sign is that couples begin to mimic each other's body movements. And when couples begin smiling and singing in unison, Love has arrived.

~~~~~Improtant fact about love~~~~~

When a person is in love, the brain apparently releases a chemical substance called "Phenylethylamine" which acts like the prescription drug "Amphetamine" to increase mental alertness and Physical energy.

If the feelings of love are dashed, the brain and body are faced with a sudden loss of "Phenylethylamine".

COURTSEY- ABC'S OF THE HUMAN MIND BOOK