As glaciers and ice sheets retreat, they are exposing objects, organisms, and landscapes that have been locked away for centuries or even millennia. Those revelations are reshaping how I understand ...

Time now for our science news roundup from our friends at NPR's Short Wave podcast. Aaron Scott and Regina Barber, welcome back. REGINA BARBER, BYLINE: Hi, Ari. AARON SCOTT, BYLINE: Thank you, Ari.