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[The Superpowered Senses of Our Canine Companions: Understanding How Dogs See the World Through Smell]-[A Dog's Nose Always Knows (Encore - 11/26/18)]

Wow in the World · B1 · 2018-11-26

Preschool Enlightenment
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📋 Summary

The Marvelous World of Canine Olfaction

In this episode of Wow in the World, Mindy and Guy Raz delve into the extraordinary biological capabilities of our canine companions, particularly focusing on how dogs experience the world through their highly evolved sense of smell. By examining the science behind "working dogs," the hosts illustrate how a dog’s nose is not just a tool for navigation, but a sophisticated instrument capable of medical detection, time-keeping, and even predicting environmental changes.

The Anatomy of a Super-Sniffer

At the heart of a dog’s ability to interact with the world is their "impressive snozz." The hosts explain that dogs possess 25 times more "olfactory receptors" than humans. These receptors are the specialized cells in the nose that detect chemical compounds in the air. Furthermore, while humans are primarily "visual creatures" who rely on the "visual cortex" to process information, dogs possess an "olfactory cortex" that is 40 times larger than that of a human. This biological disparity means that a dog’s smelling ability is roughly 100,000 times greater than our own, effectively granting them a "real-life superpower."

Medical Detection and Beyond

One of the most profound applications of this sense is the rise of "medical detection dogs." Researchers have discovered that cancerous cells, which mutate and change, release different chemicals than healthy cells. Trained dogs can identify these specific chemical signatures, allowing them to detect conditions like skin cancer or lung cancer through breath and skin samples. Beyond medical diagnostics, dogs utilize "stereoscopic sniffing." Much like how humans use "stereoscopic vision" to perceive depth by combining two slightly different images into one, dogs can use each nostril separately to pinpoint the exact location and depth of a scent, allowing them to track odors with incredible precision.

Can Dogs Smell Time and the Future?

Perhaps the most fascinating claim discussed is the dog's ability to "smell the time of day." According to Professor Alexandra Horowitz from the Dog Cognition Lab at Barnard College, dogs track how scents in a room shift as hot air rises and falls throughout the day. By analyzing these fluctuations, dogs can discern the progression of time.

Furthermore, the discussion suggests that dogs can essentially "smell the future on the breeze." Because scents are carried on wind currents, a dog may detect the presence of objects or weather changes—such as an oncoming storm—before they reach the observer. When a storm approaches, the ground loosens and releases various compounds into the air, which dogs can perceive long before humans notice a change in the atmosphere.

Social Communication: The "Calling Card"

Finally, the episode addresses the common behavior of dogs marking territory. While often misunderstood, scientists view this as a "calling card." By sniffing the urine of other dogs, canines can gather an immense amount of social data, including the age, sex, and even the recent diet of the other dog. This complex chemical communication system serves as a bulletin board, allowing dogs to stay informed about their peers without ever needing to meet face-to-face.

Through these explorations, Mindy and Guy Raz remind us that while we may live in a world defined by sight, our dogs are navigating a rich, complex, and invisible landscape of scents that provides them with a deeper connection to their environment than we could ever imagine.

🎯Key Sentences

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It's going to be a November to remember.
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But for now, let's get on with the show.
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I could have sworn I heard some...
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I know, right?
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Oh, I get it.
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📝Key Phrases

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music to your ears
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get on with the show
3
I could have sworn
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more than qualified
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on the case
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📖 Transcript

Grownups, Wondery Plus subscribers can listen to Wow in the World early and ad-free right now.
Join Wondery Plus in the Wondery app or Wondery Kids Plus on Apple Podcasts.
Hey, Wowzer fans, Mindy here.
And before we start the show, I got to let you know that this November, with a special new episode featuring our friends at Circle Round and Terrestrials on Radiolab for Kids,
And don't miss when Elmo from Sesame Street stops by Wow in the World to make us all belly laugh on November 24th.
Oh, but that's not all, Reg.

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