The 'Immature Teen Brain' and The Death Penalty Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email A man looks in Moscow on April 19, 2013, at a computer screen displaying an undated picture the 19-year-old Dzhokhar Tsarnaev posted on his is page in VKontakte, a Russian social media site. ( AFP / Getty ) Produced by Elizabeth Ross and Cameron Drews Produced by GBH, PRI and WNYC