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We talk solitary confinement in America, and hear from an architect who is urging colleagues to stop designing facilities with long-term isolation units. Then, we hear about the sketchy world that US prisons enter to obtain drugs for lethal injections. And, why just being labelled a ‘gangster’ could lengthen your sentence in an American jail.

Also, the story of an HIV survivor who scientists are hoping will help reveal some of the virus’s secrets. The essayist Deepak Singh muses on the sweet smell of traffic. And believe it or not, the best performers in the New York City subway actually audition for their spots.

(Photo: A man in solitary confinement. Credit: Getty Images)