Scott Detrow talks to Lulu Miller, the host of Radiolab's Terrestrials podcast, about her conversation with the scientist Wanda Diaz-Merced, who studies gravitational waves that ripple through spacetime.
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Scott Detrow is a White House correspondent for NPR and co-hosts the NPR Politics Podcast.
Lulu Miller is a contributing editor and co-founder of the NPR program Invisibilia.
