Polar Bear guard hair (SEM image)

Polar bear guard hair under scanning electron microscopy. Source: Nano Nature (http://www.amazon.com/Nano-Nature-Natures-Spectacular-Hidden/dp/000727842X).

Artificially colored scanning electron microscope image of a polar bear guard hair showing a hollow medulla.

Artificially colored scanning electron microscope image of a polar bear guard hair showing a hollow medulla.

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