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In 1930 the Japanese discover the material ferrite which is a compound containing ceramic material and iron. Ferrite is used to make a strong permanent magnet.

In the late 1800s, William Thompson (Lord Kelvin), created the most accurate compass for the time. It was a liquid compass where alcohol was used for the liquid so it would not freeze. The magnetic needle was magnetised by a lodestone.

In 1820 Hans Christian Oersted discovers that wire carrying an electrical current creates a magnetic field

In 1600 William Gilbert discovers Earth's magnetism and magnetic poles

In 1269 Petus de Maricourt discovers that magnets have two poles.

In the 1100s Lodestones are used for navigation

Naturally magnetic lodestones were found in an area of Greece called Magnesia

It is possible to remove the magnetism from iron by heating it up. To remove iron's magnetic properties heat it to 1500 degrees Fahrenheit (815 degrees Celsius). Removal of magnetism is useful for some machines.

Scientists measure the strength of magnetic force of a material in the unit Tesla (named after Nikola Tesla).