Terry Gross

The nominees for the 90th Academy Awards were announced Tuesday, and Paul Thomas Anderson's film Phantom Thread landed six nominations, including best director and best picture.

Harvard professors Steven Levitsky and Daniel Ziblatt are experts in what makes democracies healthy — and what leads to their collapse. They warn that American democracy is in trouble.

Frank, who died on Monday, created the radio drama series Work in Progress and was known for his intimate on-air monologues, sketches and interviews. Originally broadcast in 1989.