Emily Kwong and Regina Barber of NPR's Short Wave talk about a comet visiting from interstellar space, caterpillars that eat and break down plastic, and how animals' sense of smell varies by altitude.

They argue that unidentified, masked agents have been racially profiling and arresting people in Southern California without probable cause or access to lawyers. As NPR's Mandalit del Barco reports, ...

Marine mammal researchers are investigating how sea lions were affected by the longest toxic algal bloom on record off the coast of Southern California. Some sea lions are now being released back into ...