How do dogs "see" with their noses?

You may have heard the expression that dogs ‘see with their noses.’ 

But these creature’s amazing nasal architecture actually reveals a whole world beyond what we can see. Alexandra Horowitz illustrates how the dog’s nose can smell the past, the future and even things that can’t be seen at all. 

View full lesson: http://ed.ted.com/lessons/how-do-dogs...