The long history of using magnets for therapeutic purposes has proven the following: the practice has defined the theory. Even the ancient doctors used magnets. Aristotle (384-322BC) and Pliny the Elder wrote about the therapeutic characteristics of magnets. Dioskorid (1st cent.) advised the usage of magnets against depression. Cooled lava which contains the Earth’s natural magnetism was successfully used in treatments in the pre-Christian cultures of Egypt, Greece, India and China. Avicenna (980-1037) claimed that magnets can be used to treat the illnesses of wrists and also stated that magnets draw out poisons from the body. Historians argue where the magnet was used first – in medicine or in navigation. It is best described in an old manuscript: “Kept in a wooden chamber between the camel’s humps, a bowl with a small piece of a magnetized iron travelled on the buoy floating in water. The parts of the bowl were coloured in four colours. Red indicated south, black north, green east and white west.” But there are other testimonies as well. In Old Greek manuscripts you will find stories about “Pillar of Heracles” which has transcendental powers and is also called the “Wise iron” and the “Divine stone”. In 1600 in London a book came out written by a mathematician and a famous London doctor who treated Queen Elisabeth and King Jacob. The title was: “On magnets, magnetic bodies and the big magnet- Earth”. The author of the book, William Gilbert (1544-1603) a well known explorer, writes about the usage of magnets. It is Gilbert who first presented the idea that Earth is really one big magnet. «Magnus magnes ipse est globus terrestris» he wrote in Latin. Gilbert’s explorations in the field of medical and scientific usage of a magnet’s energy had a strong impact on the later development of these fields. Gilbert wrote: “Magnet gives health and beauty back to pale women” and “How to use a magnet if you suffer from liver enlargement”.