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.

And I'm Mary Louise Kelly, and it is time now for our science news round up from Short Wave, NPR's science podcast. This week I am joined by Regina Barber and Rachel Carlson. Hey, you two. REGINA ...

Time now for our science news roundup from Short Wave, NPR's science podcast. And we have the show's two hosts here, Regina Barber and Emily Kwong. Hello. REGINA BARBER, BYLINE: Hey. EMILY KWONG, ...

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It's time now for our science news roundup from Short Wave, NPR's science podcast. And I'm joined now by Emily Kwong and Berly McCoy from the show. Hi to both of you. BERLY MCCOY, BYLINE: Hi, Juana.

Time now for our science news roundup from Short Wave, NPR's science podcast. I am joined by science correspondent Katia Riddle and Short Wave host Regina Barber. Hey, there. REGINA BARBER, BYLINE: ...

It's ALL THINGS CONSIDERED from NPR News. I'm Scott Detrow. MARY LOUISE KELLY, HOST: And I'm Mary Louise Kelly, and it is time now for our science news round up from Short Wave, NPR's science podcast.