The existence of midi-chlorians was known to both the Jedi[1] and the Sith.[10] The Jedi Order utilized the scientific procedure of blood testing to estimate the number of midi-chlorians within prospective initiates. In addition to their scientific knowledge of midi-chlorians, Jedi philosophy held that the midi-chlorians were the foundation of all life itself. Therefore, life could not exist without the midi-chlorians.[1]