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This week in science: chocolate, daytime drowsiness and seabirds' bathroom habits

NPR's Hannah Chinn and Emily Kwong talk about the microbes behind great-tasting chocolate, possible reasons for daytime drowsiness, and a curious observation about the poop of seabirds.

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.
Hannah Chinn
Hannah Chinn (they/them) is a producer on NPR's science podcast Short Wave. Prior to joining Short Wave, they produced Good Luck Media's inaugural "climate thriller" podcast. Before that, they worked on Spotify & Gimlet Media shows such as Conviction, How to Save a Planet and Reply All. Previous pit stops also include WHYY, as well as Willamette Week and The Philadelphia Inquirer. In between, they've worked a number of non-journalism gigs at various vintage stores, coffee shops and haunted houses.
Mary Louise Kelly
Mary Louise Kelly is a co-host of All Things Considered, NPR's award-winning afternoon newsmagazine.
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