Did you know that essential oils were formerly called quintessential oils? The name comes from the Aristotelian concept that matter is made up of four elements: water, earth, air, fire. The fifth element is believed to be the quintessence, otherwise known as the "life force". And the way to extract the life force from plants is through the processes of distillation and evaporation. Thus, each time you inhale the fragrance of the essential oil of a...