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Full Program: Dr. Sagan compares explorers who ventured in sailing ships halfway around our planet in their quest for wealth and knowledge to the excitement around Voyager's expeditions to Jupiter and Saturn. 01:00:59
An introductory video to Peter Davis, one of the forty 2011 Student Freedom Riders. 00:53
Full Program: GUEST: Dr. Ellen Chesler 28:49
Filmmaker Robin Hessman talks about the making of "My Perestroika." 18:18
What role did this clock play in keeping 19th century America running on time? 15:24