You can see it, feel it, & often there is sexual excitement in the air. The adrenaline is building up in your brain & the endorphins are racing creating excitement & anticipation prior during & after each contact with this special person. Chemistry is a wonder of the world. Because if it's not there then it can't be bought borrowed or simulated. When you have chemistry in your life the world lights up & when you dont, you are looking for the light switch.