The 16th century meeting of the civilizations of Europe and the Americas is one of the most influential periods in the history of the modern world. The processes set in motion by the “Contact” have shaped, and will continue to shape, the lives of countless people. As with so much else in the popular imagination, the myths surrounding the “discovery of the New World” have far more currency than the facts. Which is why KPCC, ever the educators, are screening When Worlds Collide: The Untold Story of the Americas After Columbus, a 90-minute documentary examining the 100 years following the initial encounter between Europeans and native peoples. Special emphasis is given to the birth of mestizo culture, a heritage shared by more than 30 million Latinos in the U.S. alone. The screening is this Saturday in the spiffy new Crawford Family Forum.