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 About This Episode 
 
 Neil deGrasse Tyson’s exclusive, one-on-one conversation with whistleblower Edward Snowden – via robotic telepresence from Moscow – concludes with a deeper dive into metadata, personal privacy and covert communications. Join us as Edward takes us further down the rabbit hole, where countries spy on their own citizens to protect them and “mere” metadata can be more intrusive and invasive than the actual content of a phone call. Decipher the differences between symmetric encryption, asymmetric encryption and secret sharing schemes. But this episode isn’t just advanced math and n-dimensional matrices – Neil and Edward leave Earth behind and dive into the wavelengths of pulsars and cosmic background radiation in search of the perfect random number generator for an ideal seed value. Plus, Neil and Edward discuss the difficulty of separating the signal from the noise, both in astrophysics and in government mass surveillance. 
 
 NOTE: All-Access subscribers can listen to this entire episode commercial-free here: A Conversation with Edward Snowden (Part 2). 
 
 In This Episode 
 
 Host Neil deGrasse Tyson 
 
 Astrophysicist 
 
 Neil deGrasse Tyson Astrophysicist Guest Edward Snowden 
 
 Whistleblower 
 
 Related Episodes 
 
 Episode Topics 

 Tweet with a location 
 
 You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
– "Can you hear me now?" isn't just a Verizon catchphrase anymore. It was also the first official tweet from Edward Snowden on Tuesday from wherever he's holed up in Russia, the Intercept reports. He was apparently cajoled into joining by Neil deGrasse Tyson during a StarTalk Radio interview on Friday in which Tyson asked the ex-NSA contractor why he wasn't on the social media site. "You kind of need a Twitter handle. So like @Snowden, maybe? Is this something you might do?" Tyson said. "That sounds good, I think we've got to make it … happen," Snowden replied. As of now, the verified @snowden handle boasts a bio that says, "I used to work for the government. Now I work for the public," as well as 163,000 followers (and climbing) in the first hour after the handle debuted. He only has two tweets so far: the original and a second one thanking Tyson for his welcome and adding: "And now we've got water on Mars! Do you think they check passports at the border? Asking for a friend." Snowden is only following one other tweep at this time: the NSA. (Wonder what Snowden's Twitter password is?)