The technology of the 20th century has delved into the tiniest particles of life and has revealed that the cell is the most complex system mankind has ever confronted. Today we know that the cell contains power stations producing the energy to be used by the cell, factories manufacturing the enzymes and hormones essential for life, a data bank where all the necessary information about all products to be produced is recorded, complex transportation systems and pipelines for carrying raw materials and products from one place to another, advanced laboratories and refineries for breaking down external raw materials into their useable parts, and specialised cell membrane proteins to control the incoming and outgoing materials. And these constitute only a small part of this incredibly complex system.