The word ‘Chiropractic’ comes from the Greek words cheir (meaning ‘hand’) and praktos (meaning ‘done’), i.e. Done by Hand. The name was chosen by the developer of chiropractic, Daniel David Palmer. A prolific reader of all things scientific, DD Palmer realized that although various forms of manipulation had been used for hundreds if not thousands of years, no one had developed a philosophical or scientific rationale to explain their effects. Palmer’s major contribution to the health field was therefore the codification of the philosophy, art and science of chiropractic which was based on his extensive study of anatomy and physiology. Today, there are more than 70,000 active chiropractic licenses in the United States. All 50 states, the District of Columbia, Puerto Rico, and the U.S. Virgin Islands officially recognize chiropractic as a health care profession. Many other countries also recognize and regulate chiropractic, including Canada, Mexico, Great Britain, Australia, Japan and Switzerland.