And how the seemingly endless wait in the US is affecting their development.This episode was produced by Victoria Chamberlin, edited by Sean Rameswaram and Matt Collette, fact-checked by Laura Bullard and Victoria Dominguez, engineered by Paul Mounsey, and hosted by Noel King.Here's a link if you want to contribute to Today, Explained to Kids: bit.ly/texkidsTranscript at vox.com/todayexplained  Support Today, Explained by making a financial contribution to Vox! bit.ly/givepodcastsLearn more about your ad choices. Visit podcastchoices.com/adchoices