Neil deGrasse Tyson: It matters what is the significance of these breaches. We should all be tremendously concerned when they see governments beginning to redefine and narrow, he says. "I think that's a fundamentally illiberal direction that all free people should resist"
Neil deGrasse Tyson chats with whistleblower Edward Snowden via robotic telepresence from Moscow. In Part 1, they discuss Isaac Newton, knowledge and learning, the Periodic Table, encryption and privacy, and much more.
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