Podcasts are big right now, as big as things get in the audio world. Every media company from Buzzfeed to the New York Times is investing in them. Serial is credited with putting podcasts on the map in the culture beyond public radio, but some critics have worried that National Public Radio has been too slow to lead the pack. Now NPR has gone all in with a new podcast, Embedded. As its tagline goes, it takes a story from the news and then goes deep. Kelly McEvers , familiar to audiences as the host of All Things Considered, hosts the podcast.