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Welcome to the Science Podcast for March 21st, 2014.

I'm Sarah Crespi.

On this week's show, human scent discrimination is paged at one trillion odors and a roundup from our daily news site. Support for the science podcast is provided by AAAS, the American Association for

the Advancement of Science. Triple AS, the Science Society at www.aAS.a.s.org.

We humans can discriminate about half a million auditory tones and several million different colors.

But what about odors?

Tones and colors vary along a scale.

While odors vary in a different space with different intensities, different components, and different mixtures of different components.

...