A new wave of philanthropists wants to make charity more effective. They’re focused not just on the present day but also thousands of years into the future. Vox’s Dylan Matthews explains how “effective altruism” became a multibillion-dollar philanthropic force. This episode was produced by Miles Bryan, edited by Matt Collette, fact-checked by Laura Bullard, engineered by Efim Shapiro, and hosted by Noel King. Transcript at vox.com/todayexplained  Support Today, Explained by making a financial contribution to Vox! bit.ly/givepodcasts Learn more about your ad choices. Visit podcastchoices.com/adchoices