In 1917, Albert Einstein published a paper whereby he proposed a new method of creating light based on the principles of quantum physics.

Over 40 years later, researchers finally put Einstein’s ideas into practice.

For years it remained a solution in search of a problem. Today, the number of applications for this source of light is almost limitless and includes everything from nuclear fusion, to annoying cats. 

Learn more about Light Amplification by Stimulated Emission of Radiation, or LASERs, on this episode of Everything Everywhere Daily.

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Executive Producer: Darcy Adams

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