The United Nations has proclaimed 2015 as the 'International Year of Light'. A laser provides a very precise light, crucial in many daily activities, like using a printer or scanning items in a store. The technology is also used in communication, industry, medicine and environmental care. Charles H. Townes, who passed away in January, 99 years old, was awarded the Physics Prize for the fundamental work that led to the construction of lasers. In this video clip, he recalls the moment of eureka conceiving his idea of maser, a similar appliance for microwaves.

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