Knock, Knock Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email Making Sense of Midterm-Mania The "Caravan" Spin In Context Your Papers, Please Inoculations Against Attack Ads, Doorstep by Doorstep Central American migrants walking to the U.S. start their day departing Ciudad Hidalgo, Mexico, on Oct. 21, 2018. ( Moises Castillo / AP Images ) Produced by WNYC Studios