TED-Ed: How dogs “see” with smell

Some 300 million olfactory receptor cells (compared with 5 million in humans), specialized airflow, the ability to smell in stereo and a highly developed region of the brain for processing the information are part of why dogs can detect smells up to 100 million times less concentrated than those detected by humans. “A dog smells an entire story, from start to finish,” according to this TED-Ed video, revealing “a whole other world beyond our eyes.” The Huffington Post (2/4)

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