The Secret of Flight 6: Propulsion 

This educational series, hosted by German aeronautical engineer Dr. Alexander Lippisch, explains the mysteries of flight and the science behind it.
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Founded in 1847, the University of Iowa is the state’s first, flagship institution of higher education. The UI is home to one of the largest and most acclaimed medical centers in the country, the world-renowned Iowa Writers’ Workshop, and leading academic programs in more than 200 areas of study.