As he writes:
It’s clearer than water from an alpine mountain spring. It’s as expensive as French perfume. It’s nearly 100 years old. It’s been blessed, cursed, feared, and loved. Virtually all animals have it, or something very much like it. Horses have it. Dogs have it. Mice have it. Fish have it. So too do earthworms, fruit flies, and mosquitos.
Hope you find this enlightening.