Unexplainable is a new podcast from Vox about everything we don’t know. Each week, the team looks at the most fascinating unanswered questions in science and the mind-bending ways scientists are trying to answer them. New episodes drop every Wednesday.  This episode: Scientists still don't know how the sense of smell works. But they're looking at how powerful it is — dogs can actually sniff out cancer and many other diseases — and they're trying to figure out how to reverse-engineer it. In fact, one MIT scientist may have built a robot nose ... without completely understanding how his invention works. Learn more:  vox.com/unexplainable  Listen on Apple Podcasts: https://podcasts.apple.com/us/podcast/unexplainable/id1554578197 Listen on Spotify: https://open.spotify.com/show/0PhoePNItwrXBnmAEZgYmt?si=Y3-2TFfDT8qHkfxMjrJL2g Sign up for our newsletter:  http://vox.com/unexplainable-newsletter Learn more about your ad choices. Visit podcastchoices.com/adchoices