Humans have been having kids forever, so why are modern parents so bewildered? The economist Emily Oster marshals the evidence on the most contentious topics — breastfeeding and sleep training, vaccines and screen time — and tells her fellow parents to calm the heck down.

The banana used to be a luxury good. Now it’s the most popular fruit in the U.S. and elsewhere. But the production efficiencies that made it so cheap have also made it vulnerable to a deadly fungus that may wipe out the one variety most of us eat. Scientists do have a way to save it — but will Big Banana let them?