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Passive radar (also referred to as parasitic radar, passive coherent location, passive surveillance, and passive covert radar) is a class of radar systems that detect and track objects by processing reflections from non-cooperative sources of illumination in the environment, such as commercial broadcast and communications signals.
The effectiveness of traditional instruction and passive learning methods have been under debate for some time. [2] The modern origins of progressive education, with active learning as a component, can be traced back to the 18th century works of John Locke and Jean-Jacques Rousseau, both of whom are known as forerunners of ideas that would be developed by 20th century theorists such as John Dewey.