Greatest Inventions

$500

MRI

A medical image technique used in radiology to visualize internal structures of the body in detail. MRI makes use of the property of nuclear magnetic renosance (NMR) to image nuclei of atoms inside the body.

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Compass

A compass works by detecting the Earth’s natural magnetic fields. The Earth has an iron core that is part liquid and part solid crystal due to gravitational pressure. It is believed that movement in the liquid outer core is what produces the Earth’s magnetic field.

Credit Card

The ­black strip on the back of the credit card is magnetic. This magnetic strip is made up of tiny iron-based magnetic particles in a plastic-like film. Each particle of the magnetic strip is like a tiny bar magnet. The data is put on the magnetic strip by magnetizing the north and south poles on each of the tiny magnetic particles Price Varies!

Microphone

When the diaphragm vibrates, it causes other components in the microphone to vibrate. These vibrations are converted into an electrical current which becomes the audio signal $69.99!
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