Mother Nature. She does the difficult work. Humans - we do the farming, gathering, and distilling.
This micrograph shows the very small cells that produce and store essential oils. They are called Trichomes (pronounced TRI-combs).
Simply touching a Trichome cell will release the essential oils. When you touch an aromatic plant (like lavender, spearmint, peppermint, oregano, thyme, rosemary, etc) some of the essential oil is released from the Trichomes. You can smell the oil on your hands. You can smell it in the air.
I seriously have stashs is everywhere. I know I'm not the only one that hordes some of these amazing products from Young Living. This is just a little snap of one of my bathroom stashes. I love seeing how everyone else stores there's!