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The Earth, the moon, the stars and just about everything in between has a magnetic field, and scientists use magnetometers when they need to know the strength of those fields.

Although they have applications at the highest levels of scientific research, magnetron tubes are used every day by non-scientists who just want to heat their food in a hurry.

A number of distinguished scientists had a hand in the discovery of "wireless telegraphy," but it was the work done by Guglielmo Marconi that is credited with providing the basis of radio as we know it today.

The man most commonly associated with the telegraph, Samuel Morse, did not invent the communications tool. But he developed it, commercialized it and invented the famous code for it that bears his name.

Compasses had been steering people in the right direction for many centuries when, in the year 1820, one particular compass made a very different sort of revelation to an unsuspecting Danish science professor.

Named in honor of Danish physicist Hans Christian Ørsted, Denmark’s first satellite has been observing and mapping the magnetic field of the Earth.

From the auto shop to the doctor's office, the oscilloscope is an important diagnostic tool.

Many heads, hands and hearts contributed to the development of this lifesaving device.

French physicist Gaston Planté invented the first rechargeable battery, leaving an enduring legacy in battery history. To see it, just pop the hood of your car.

Spurred by Hans Christian Ørsted's discovery of a relationship between electricity and magnetism, German chemist Julian Schweigger immediately began tinkering and soon came up with a very early galvanometer known as the Schweigger multiplier.

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Magnet Academy is a free resource on magnetism & electricity brought to you by the Center for Integrating Research + Learning at the National High Magnetic Field Laboratory.