 From NPR News, this is All Things Considered. I'm Scott Detrow. And I'm Ari Shapiro. Time now for our regular science news roundup with our friends at NPR's shortwave podcast, Regina Barber and Burleigh McCoy. Good to have you both back. Hey, Ari. Hi, Ari. So the way this works is you bring us three science stories that caught your attention this week. What have you got for us today?