What happens when one of the world’s biggest cities faces a water crisis? That’s the case in Mexico City, where a mix of drought and faulty infrastructure is testing the water system – and millions of residents.

How bullying shaped the surgeon general's fight against social media

Post Reports is the daily podcast from The Washington Post. Unparalleled reporting. Expert insight. Clear analysis. Everything you’ve come to expect from the newsroom of The Post, for your ears. Martine Powers and Elahe Izadi are your hosts, asking the questions you didn’t know you wanted answered. Published weekdays around 5 p.m. Eastern time.