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This week in science: How much exercise you need, flu resistance and fortified food

NPR's science podcast Short Wave brings us stories on food fortification, why some people don't seem to get the flu, and a study on how much vigorous exercise you really need.

Copyright 2026 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.