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Outrage at the death of a Cincinnati Zoo gorilla; Brian Greene and the World Science Festival; life as an undercover cop; the mayor of the Greek city of Thessaloniki. (episode)
How much responsibility does a Zoo have to keep a child safe?
Brian Pallasch of the American Society of Civil Engineers discusses some of the biggest infrastructure projects in America’s history and the politics behind these projects.
Theoretical physicist Brian Greene and oceanographer Sylvia Earle talk about this year's line-up of events.
Stevie "Stevie Gunz" Stryker, a retired NYPD detective, talks about his time as an undercover officer and explains why most cop shows get everything wrong.
Yiannis Boutaris, the current mayor of Thessaloniki, discusses Greece's role in accepting refugees from ailing countries.