Eva Moskowitz; The Nation Magazine; Instability in Yemen; Science of Hedonism

Ted Cruz officially announced his candidacy for the Republican nomination for president. The Washington Post's Philip Bump explains where Cruz hopes to get support (in the form of votes and cash). Plus: Eva Moskowitz, founder and CEO of the Success Academy Charter Network; The Nation editor and publisher Katrina vanden Heuvel celebrates the magazine's 150th anniversary and discusses its place in progressive thought; instability in Yemen means it's (even more of) a hotbed of extremism and the science of why we're drawn to sex, drugs and rock 'n' roll.