Dogs can smell cancer, Covid-19, and many other health problems in humans. Now, scientists are trying to duplicate these powers in robotic sniffers. But there’s a big challenge here: Scientists don’t really understand how smell works.This is the third episode of our six-part series, Making Sense, and it originally ran on March 10, 2021.For more, go to http://vox.com/unexplainableIt’s a great place to view show transcripts and read more about the topics on our show.Also, email us! [email protected] read every email.Support Unexplainable by making a financial contribution to Vox! bit.ly/givepodcasts

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