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This week in science: a comet, plastic-eating bugs, and how altitude changes smell

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.

Copyright 2025 NPR

Emily Kwong
Emily Kwong (she/her) is the founding reporter and now co-host for Short Wave, NPR's daily science podcast. Her first homework assignment in kindergarten was to bring in a leaf to class. She's been looking at trees ever since.
Regina G. Barber
Regina G. Barber is Short Wave's Scientist in Residence. She contributes original reporting on STEM and guest hosts the show.