Scientists have been trying for decades to understand these magnificent creatures, which can grow longer than a typical house. Michelle Fournet and her colleagues at the University of New Hampshire have been breaking new ground: They record the whales' daily communications in Alaska, and then send whale recordings back to the giant animals to see if and how they respond. Some of Michelle's latest findings suggest that they can identify individual whales by their sounds. Michelle tells us the moving story of how she morphed from broke actor to internationally-respected whale researcher, and how she hopes research on humpbacks' "language" can help humans protect them - and respect the natural world better.

As US, Israeli and Iranian leaders trade bombs and threats, this episode will help remind you one reason why Iran's government learned to detest the US long ago: The US and Britain secretly ran the plot to topple its leader in the 1950s. Why? For Iran's oil. Filmmakers Taghi Amirani and Walter Murch discuss their riveting documentary, Coup 53 - which shows step by step how the CIA and MI6 carried it out. Nations are like people: once they've been traumatized, it's hard to forget.

As we post this episode, Trump has sent Marines and Army National Guard troops to the streets, to try to quash protests by fellow citizens - the vast majority of them peaceful. Our guest Elizabeth Gotein, of the nonpartisan Brennan Center for Justice, has warned us before that any U.S. president could wield dozens of sweeping emergency powers to dismantle democracy, some so secret that members of Congress don't even know about them. We repeated Liz's episode last year and we're repeating it again: The crisis created by Trump and his allies is that serious.