The Ancient Egyptians noticed that the veins and arteries, as well as many nerves, radiate outwards from the heart, and concluded that it was central to both reason and emotion. Later, the Ancient Greeks moved responsibility for rational thought to the brain, but passion has always remained associated with the heart.
The adrenaline surge from any strong emotion has a powerful effect on our heart rate, so naturally we feel the pangs of love and attraction in our chest first.
Luis trained as a zoologist, but now works as a science and technology educator. In his spare time he builds 3D-printed robots, in the hope that he will be spared when the revolution inevitably comes.