“Unlike journalists, publishers have never seen it as their purview to verify that the information in nonfiction books is true. Editors and publishers say the profit-margins in publishing don’t allow for hiring fact-checkers. Instead, they rely on authors to be honest, and on their legal staffs to avoid libels suits. But now there is a growing chorus both inside and outside the industry calling for publishers to take more steps to validate the authenticity of works that are marketed as nonfiction.”