Whistle-blower Edward Snowden has some strong opinions on communications — even when those communications are coming from aliens. The former intelligence-agency contractor turned fugitive was an unexpected guest on famous astrophysicist Neil deGrasse Tyson's StarTalk podcast on September 18. And, inevitably, the two got to talking about extraterrestrials. Snowden became an infamous household name in 2013 when he leaked classified documents divulging the government's top-secret mass-surveillance program, which involved collecting personal information on Americans via phone records without their knowledge. When the news broke, the US charged him with theft and espionage, and he's now living in Russia where he...