A primary source gives us first-hand information. it states the automatic facts, and not what has been heard through a second-hand information (sencondary source). it provides information like: direct or firsthand evidence about an event, object, person, or work of art.
and examples are: eyewitness accounts, results of experiments, and statistical data
Ultraviolet, visible, and infrared.
Because of hitler mostly but hitler did not make the holacaust alone
