Terry Gross

Journalists Michael Kranish and his Washington Post colleague Marc Fisher are the authors of Trump Revealed, a biography about Trump's life and career that is based on the work of more than 20 of the Post's reporters, editors and fact-checkers.

Author Frederick Clarkson wrote the book Eternal Hostility: The Struggle Between Theocracy And Democracy, on the growing religious movement to influence government. Clarkson has written articles on the religious right's plans to take over the Republican Party, and how elements of the right encouraged citizen militias.

Ed Yong, author of I Contain Multitudes, says someday we might be able to improve our health by taking probiotics, but "we are still in the very early stages of working out how to do this."