John Hudson on the ouster of national security adviser John Bolton. Reed Albergotti describes Apple’s dual role in the app economy. And Lena Sun breaks down the chemical linked to recent vaping-related illnesses and deaths.

The ‘South Atlantic blob’: The vulnerability of the world’s warming oceans

Post Reports is the daily podcast from The Washington Post. Unparalleled reporting. Expert insight. Clear analysis. Everything you’ve come to expect from the newsroom of The Post, for your ears. Martine Powers and Elahe Izadi are your hosts, asking the questions you didn’t know you wanted answered. Published weekdays around 5 p.m. Eastern time.