Hi Bob.

Morning Kelly.

The tulips look great.

Have you ever wondered how your dog experiences the world?

Here's what she sees.

Not terribly interesting.

But what she smells, that's a totally different story and it begins at her wonderfully developed nose.

As your dog catches the first hints of fresh air, her nose 's moist, spongy outside helps capture any scents the breeze carries.

The ability to smell separately with each nostril - smelling in stereo - helps to determine the direction of the smell 's source.

So that within the first few moments of sniffing, the dog starts to become aware of not just what kinds of things are out there, but also where they're located.

As air enters the nose, a small fold of tissue divides it into two separate folds : one for breathing and one just for smelling.

This second airflow enters a region filled with highly specialized olfactory receptor cells, several hundred millions of them, compared to our five million.

And unlike our clumsy way of breathing in and out through the same passage, dogs exhale through slits at the side of their nose, creating swirls of air that help draw in new odor molecules and allow odor concentration to build up over multiple sniffs.

But all that impressive nasal architecture wouldn't be much help without something to process the loads of information the nose scoops up.

And it turns out that the olfactory system dedicated to processing smells, takes up many times more relative brain area in dogs than in humans.

All of this allows dogs to distinguish and remember a staggering variety of specific scents at concentrations up to 100 million times less than what our noses can detect.